diff --git a/go.mod b/go.mod
index 922d2b857..305fa05c4 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.15
 require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/ChainSafe/go-schnorrkel v0.0.0-20200405005733-88cbf1b4c40d
-	github.com/Workiva/go-datastructures v1.0.52
+	github.com/Workiva/go-datastructures v1.0.2
 	github.com/btcsuite/btcd v0.21.0-beta
 	github.com/btcsuite/btcutil v1.0.2
 	github.com/confio/ics23/go v0.6.3
@@ -15,6 +15,7 @@ require (
 	github.com/go-logfmt/logfmt v0.5.0
 	github.com/gogo/protobuf v1.3.2
 	github.com/golang/protobuf v1.4.3
+	github.com/google/orderedcode v0.0.1
 	github.com/gorilla/websocket v1.4.2
 	github.com/gtank/merlin v0.1.1
 	github.com/herumi/bls-eth-go-binary v0.0.0-20200923072303-32b29e5d8cbf
diff --git a/go.sum b/go.sum
index b47f74c33..39ce3f049 100644
--- a/go.sum
+++ b/go.sum
@@ -1,3 +1,6 @@
+4d63.com/gochecknoglobals v0.1.0/go.mod h1:wfdC5ZjKSPr7CybKEcgJhUOgeAQW1+7WcyK8OvUilfo=
+bazil.org/fuse v0.0.0-20200407214033-5883e5a4b512/go.mod h1:FbcW6z/2VytnFDhZfumh8Ss8zxHE6qpMP5sHTRe0EaM=
+bitbucket.org/creachadair/shell v0.0.6/go.mod h1:8Qqi/cYk7vPnsOePHroKXDJYmb5x7ENhtiFtfZq8K+M=
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
@@ -5,29 +8,88 @@ cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6A
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
 cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.60.0/go.mod h1:yw2G51M9IfRboUH61Us8GqCeF1PzPblB823Mn2q2eAU=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
+cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
+cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
+cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
+cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
+cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
+cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
+cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
+cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
+cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
+cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
 cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/firestore v1.6.0/go.mod h1:afJwI0vaXwAG54kI7A//lP/lSPDkQORQuMkv56TxEPU=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
+cloud.google.com/go/pubsub v1.5.0/go.mod h1:ZEwJccE3z93Z2HWvstpri00jOg7oO4UZDtKhwDwqF0w=
+cloud.google.com/go/spanner v1.7.0/go.mod h1:sd3K2gZ9Fd0vMPLXzeCrF6fq4i63Q7aTLW/lBIfBkIk=
 cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
+cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
+cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
+contrib.go.opencensus.io/exporter/stackdriver v0.13.4/go.mod h1:aXENhDJ1Y4lIg4EUaVTwzvYETVNZk10Pu26tevFKLUc=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 gioui.org v0.0.0-20210308172011-57750fc8a0a6/go.mod h1:RSH6KIUZ0p2xy5zHDxgAM4zumjgTw83q2ge/PI+yyw8=
+github.com/Antonboom/errname v0.1.5/go.mod h1:DugbBstvPFQbv/5uLcRRzfrNqKE9tVdVCqWCLp6Cifo=
+github.com/Antonboom/nilnil v0.1.0/go.mod h1:PhHLvRPSghY5Y7mX4TW+BHZQYo1A8flE5H20D3IPZBo=
+github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1/go.mod h1:xomTg63KZ2rFqZQzSB4Vz2SUXa1BpHTVz9L5PTmPC4E=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/toml v0.4.1 h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=
+github.com/BurntSushi/toml v0.4.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/ChainSafe/go-schnorrkel v0.0.0-20200405005733-88cbf1b4c40d h1:nalkkPQcITbvhmL4+C4cKA87NW0tfm3Kl9VXRoPywFg=
 github.com/ChainSafe/go-schnorrkel v0.0.0-20200405005733-88cbf1b4c40d/go.mod h1:URdX5+vg25ts3aCh8H5IFZybJYKWhJHYMTnf+ULtoC4=
+github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
 github.com/DataDog/zstd v1.4.1 h1:3oxKN3wbHibqx897utPC2LTQU4J+IHWWJO+glkAkpFM=
 github.com/DataDog/zstd v1.4.1/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
+github.com/Djarvur/go-err113 v0.0.0-20210108212216-aea10b59be24/go.mod h1:4UJr5HIiMZrwgkSPdsjy2uOQExX/WEILpIrO9UPGuXs=
+github.com/HdrHistogram/hdrhistogram-go v1.1.0/go.mod h1:yDgFjdqOqDEKOvasDdhWNXYg9BVp4O+o5f6V/ehm6Oo=
+github.com/HdrHistogram/hdrhistogram-go v1.1.2/go.mod h1:yDgFjdqOqDEKOvasDdhWNXYg9BVp4O+o5f6V/ehm6Oo=
 github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
+github.com/Masterminds/goutils v1.1.0/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
+github.com/Masterminds/semver v1.4.2/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
+github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
+github.com/Masterminds/sprig v2.15.0+incompatible/go.mod h1:y6hNFY5UBTIWBxnzTeuNhlNS5hqE0NB0E6fgfo2Br3o=
+github.com/Masterminds/sprig v2.22.0+incompatible/go.mod h1:y6hNFY5UBTIWBxnzTeuNhlNS5hqE0NB0E6fgfo2Br3o=
+github.com/Microsoft/go-winio v0.5.0/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
+github.com/Nvveen/Gotty v0.0.0-20120604004816-cd527374f1e5/go.mod h1:lmUJ/7eu/Q8D7ML55dXQrVaamCz2vxCfdQBasLZfHKk=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/OpenPeeDeeP/depguard v1.0.1/go.mod h1:xsIw86fROiiwelg+jB2uM9PiKihMMmUx/1V+TNhjQvM=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
+github.com/StackExchange/wmi v1.2.1/go.mod h1:rcmrprowKIVzvc+NUiLncP2uuArMWLCbu9SBzvHz7e8=
 github.com/VividCortex/gohistogram v1.0.0 h1:6+hBz+qvs0JOrrNhhmR7lFxo5sINxBCGXrdtl/UvroE=
 github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
+github.com/Workiva/go-datastructures v1.0.2 h1:gYV7WT8obGQ3dgnzndt+7Ukr9IYRkkRaPNkahB2v8iI=
+github.com/Workiva/go-datastructures v1.0.2/go.mod h1:Z+F2Rca0qCsVYDS8z7bAGm8f3UkzuWYS/oBZz5a7VVA=
 github.com/Workiva/go-datastructures v1.0.52 h1:PLSK6pwn8mYdaoaCZEMsXBpBotr4HHn9abU0yMQt0NI=
 github.com/Workiva/go-datastructures v1.0.52/go.mod h1:Z+F2Rca0qCsVYDS8z7bAGm8f3UkzuWYS/oBZz5a7VVA=
+github.com/Workiva/go-datastructures v1.0.53 h1:J6Y/52yX10Xc5JjXmGtWoSSxs3mZnGSaq37xZZh7Yig=
+github.com/Workiva/go-datastructures v1.0.53/go.mod h1:1yZL+zfsztete+ePzZz/Zb1/t5BnDuE2Ya2MMGhzP6A=
+github.com/adlio/schema v1.1.14/go.mod h1:hQveFEMiDlG/M9yz9RAajnH5DzT6nAfqOG9YkEQU2pg=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
 github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
 github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
@@ -36,30 +98,58 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/alexkohler/prealloc v1.0.0/go.mod h1:VetnK3dIgFBBKmg0YnD9F9x6Icjd+9cvfHR56wJVlKE=
+github.com/andybalholm/brotli v1.0.2/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
+github.com/andybalholm/brotli v1.0.3/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/antihax/optional v0.0.0-20180407024304-ca021399b1a6/go.mod h1:V8iCPQYkqmusNa815XgQio277wI47sdRh1dUOLdyC6Q=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
+github.com/aokoli/goutils v1.0.1/go.mod h1:SijmP0QR8LtwsmDs8Yii5Z/S4trXFGFC2oO5g9DP+DQ=
 github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-metrics v0.3.9/go.mod h1:4O98XIr/9W0sxpJ8UaYkvjk10Iff7SnFrb4QAOwNTFc=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
+github.com/ashanbrown/forbidigo v1.2.0/go.mod h1:vVW7PEdqEFqapJe95xHkTfB1+XvZXBFg8t0sG2FIxmI=
+github.com/ashanbrown/makezero v0.0.0-20210520155254-b6261585ddde/go.mod h1:oG9Dnez7/ESBqc4EdrdNlryeo7d0KcW1ftXHm7nU/UU=
 github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
+github.com/aws/aws-sdk-go v1.23.20/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go v1.25.37/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
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@@ -67,22 +157,46 @@ github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku
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@@ -91,6 +205,8 @@ github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
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@@ -99,11 +215,16 @@ github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwc
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@@ -112,6 +233,8 @@ github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZm
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@@ -122,61 +245,134 @@ github.com/edsrzf/mmap-go v1.0.0/go.mod h1:YO35OhQPt3KJa3ryjFM5Bs14WD66h8eGKpfaB
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@@ -401,9 +843,13 @@ github.com/prometheus/common v0.2.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y8
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@@ -412,28 +858,64 @@ github.com/prometheus/procfs v0.0.8/go.mod h1:7Qr8sr6344vo1JqZ6HhLceV9o3AJ1Ff+Gx
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@@ -521,13 +1094,24 @@ golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACk
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@@ -696,14 +1493,44 @@ google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEt
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@@ -712,9 +1539,58 @@ google.golang.org/genproto v0.0.0-20190530194941-fb225487d101/go.mod h1:z3L6/3dT
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+google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
+google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
+google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
+google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
+google.golang.org/grpc v1.41.0/go.mod h1:U3l9uK9J0sini8mHphKoXyaqDA/8VyGnDee1zzIUK6k=
+google.golang.org/grpc v1.42.0 h1:XT2/MFpuPFsEX2fWh3YQtHkZ+WYZFQRfaUgLZYj/p6A=
+google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -737,19 +1636,33 @@ google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzi
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
+google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b h1:QRR6H1YWRnHb4Y/HeNFCTJLFVxaq6wH4YuVdsUOr75U=
+gopkg.in/check.v1 v1.0.0-20200902074654-038fdea0a05b/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/cheggaaa/pb.v1 v1.0.25/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/cheggaaa/pb.v1 v1.0.28/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
+gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
+gopkg.in/go-playground/validator.v9 v9.29.1/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
 gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
 gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.63.2 h1:tGK/CyBg7SMzb60vP1M03vNZ3VDu3wGQJwn7Sxi9r3c=
+gopkg.in/ini.v1 v1.63.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
@@ -757,20 +1670,38 @@ gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRN
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.6/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
+gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+honnef.co/go/tools v0.2.1/go.mod h1:lPVVZ2BS5TfnjLyizF7o7hv7j9/L+8cZY2hLyjP9cGY=
+mvdan.cc/gofumpt v0.1.1/go.mod h1:yXG1r1WqZVKWbVRtBWKWX9+CxGYfA51nSomhM0woR48=
+mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
+mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
+mvdan.cc/unparam v0.0.0-20210104141923-aac4ce9116a7/go.mod h1:hBpJkZE8H/sb+VRFvw2+rBpHNsTBcvSpk61hr8mzXZE=
+pgregory.net/rapid v0.4.7/go.mod h1:UYpPVyjFHzYBGHIxLFoupi8vwk6rXNzRY9OMvVxFIOU=
 rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/pdf v0.1.1/go.mod h1:n8OzWcQ6Sp37PL01nO98y4iUCRdTGarVfzxY20ICaU4=
+rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
 sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
+sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
diff --git a/light/proxy/routes.go b/light/proxy/routes.go
index e3f139dc6..4cbf26117 100644
--- a/light/proxy/routes.go
+++ b/light/proxy/routes.go
@@ -29,6 +29,7 @@ func RPCRoutes(c *lrpc.Client) map[string]*rpcserver.RPCFunc {
 		"commit":               rpcserver.NewRPCFunc(makeCommitFunc(c), "height"),
 		"tx":                   rpcserver.NewRPCFunc(makeTxFunc(c), "hash,prove"),
 		"tx_search":            rpcserver.NewRPCFunc(makeTxSearchFunc(c), "query,prove,page,per_page,order_by"),
+		"block_search":         rpcserver.NewRPCFunc(makeBlockSearchFunc(c), "query,page,per_page,order_by"),
 		"validators":           rpcserver.NewRPCFunc(makeValidatorsFunc(c), "height,page,per_page"),
 		"voters":               rpcserver.NewRPCFunc(makeVotersFunc(c), "height,page,per_page"),
 		"dump_consensus_state": rpcserver.NewRPCFunc(makeDumpConsensusStateFunc(c), ""),
@@ -132,16 +133,46 @@ func makeTxFunc(c *lrpc.Client) rpcTxFunc {
 	}
 }
 
-type rpcTxSearchFunc func(ctx *rpctypes.Context, query string, prove bool,
-	page, perPage *int, orderBy string) (*ctypes.ResultTxSearch, error)
+type rpcTxSearchFunc func(
+	ctx *rpctypes.Context,
+	query string,
+	prove bool,
+	page, perPage *int,
+	orderBy string,
+) (*ctypes.ResultTxSearch, error)
 
 func makeTxSearchFunc(c *lrpc.Client) rpcTxSearchFunc {
-	return func(ctx *rpctypes.Context, query string, prove bool, page, perPage *int, orderBy string) (
-		*ctypes.ResultTxSearch, error) {
+	return func(
+		ctx *rpctypes.Context,
+		query string,
+		prove bool,
+		page, perPage *int,
+		orderBy string,
+	) (*ctypes.ResultTxSearch, error) {
 		return c.TxSearch(ctx.Context(), query, prove, page, perPage, orderBy)
 	}
 }
 
+type rpcBlockSearchFunc func(
+	ctx *rpctypes.Context,
+	query string,
+	prove bool,
+	page, perPage *int,
+	orderBy string,
+) (*ctypes.ResultBlockSearch, error)
+
+func makeBlockSearchFunc(c *lrpc.Client) rpcBlockSearchFunc {
+	return func(
+		ctx *rpctypes.Context,
+		query string,
+		prove bool,
+		page, perPage *int,
+		orderBy string,
+	) (*ctypes.ResultBlockSearch, error) {
+		return c.BlockSearch(ctx.Context(), query, page, perPage, orderBy)
+	}
+}
+
 type rpcValidatorsFunc func(ctx *rpctypes.Context, height *int64,
 	page, perPage *int) (*ctypes.ResultValidators, error)
 
diff --git a/light/rpc/client.go b/light/rpc/client.go
index fe34d905b..f3346569d 100644
--- a/light/rpc/client.go
+++ b/light/rpc/client.go
@@ -34,15 +34,18 @@ type LightClient interface {
 	TrustedLightBlock(height int64) (*types.LightBlock, error)
 }
 
+var _ rpcclient.Client = (*Client)(nil)
+
 // Client is an RPC client, which uses light#Client to verify data (if it can
-// be proved!). merkle.DefaultProofRuntime is used to verify values returned by
-// ABCIQuery.
+// be proved). Note, merkle.DefaultProofRuntime is used to verify values
+// returned by ABCI#Query.
 type Client struct {
 	service.BaseService
 
 	next rpcclient.Client
 	lc   LightClient
-	// Proof runtime used to verify values returned by ABCIQuery
+
+	// proof runtime used to verify values returned by ABCIQuery
 	prt       *merkle.ProofRuntime
 	keyPathFn KeyPathFunc
 }
@@ -448,11 +451,25 @@ func (c *Client) Tx(ctx context.Context, hash []byte, prove bool) (*ctypes.Resul
 	return res, res.Proof.Validate(l.DataHash)
 }
 
-func (c *Client) TxSearch(ctx context.Context, query string, prove bool, page, perPage *int, orderBy string) (
-	*ctypes.ResultTxSearch, error) {
+func (c *Client) TxSearch(
+	ctx context.Context,
+	query string,
+	prove bool,
+	page, perPage *int,
+	orderBy string,
+) (*ctypes.ResultTxSearch, error) {
 	return c.next.TxSearch(ctx, query, prove, page, perPage, orderBy)
 }
 
+func (c *Client) BlockSearch(
+	ctx context.Context,
+	query string,
+	page, perPage *int,
+	orderBy string,
+) (*ctypes.ResultBlockSearch, error) {
+	return c.next.BlockSearch(ctx, query, page, perPage, orderBy)
+}
+
 // Validators fetches and verifies validators.
 //
 // WARNING: only full validator sets are verified (when length of validators is
@@ -462,8 +479,9 @@ func (c *Client) Validators(
 	height *int64,
 	pagePtr, perPagePtr *int,
 ) (*ctypes.ResultValidators, error) {
-	// Update the light client if we're behind and retrieve the light block at the requested height
-	// or at the latest height if no height is provided.
+
+	// Update the light client if we're behind and retrieve the light block at the
+	// requested height or at the latest height if no height is provided.
 	l, err := c.updateLightClientIfNeededTo(ctx, height)
 	if err != nil {
 		return nil, err
@@ -477,7 +495,6 @@ func (c *Client) Validators(
 	}
 
 	skipCount := validateSkipCount(page, perPage)
-
 	v := l.ValidatorSet.Validators[skipCount : skipCount+tmmath.MinInt(perPage, totalCount-skipCount)]
 
 	return &ctypes.ResultValidators{
diff --git a/node/node.go b/node/node.go
index d1dd3bfdd..839283575 100644
--- a/node/node.go
+++ b/node/node.go
@@ -17,6 +17,7 @@ import (
 	"github.com/rs/cors"
 
 	dbm "github.com/line/tm-db/v2"
+	pdbm "github.com/line/tm-db/v2/prefixdb"
 
 	abci "github.com/line/ostracon/abci/types"
 	bcv0 "github.com/line/ostracon/blockchain/v0"
@@ -40,6 +41,9 @@ import (
 	grpccore "github.com/line/ostracon/rpc/grpc"
 	rpcserver "github.com/line/ostracon/rpc/jsonrpc/server"
 	sm "github.com/line/ostracon/state"
+	"github.com/line/ostracon/state/indexer"
+	blockidxkv "github.com/line/ostracon/state/indexer/block/kv"
+	blockidxnull "github.com/line/ostracon/state/indexer/block/null"
 	"github.com/line/ostracon/state/txindex"
 	"github.com/line/ostracon/state/txindex/kv"
 	"github.com/line/ostracon/state/txindex/null"
@@ -133,7 +137,7 @@ func DefaultMetricsProvider(config *cfg.InstrumentationConfig) MetricsProvider {
 type Option func(*Node)
 
 // Temporary interface for switching to fast sync, we should get rid of v0 and v1 reactors.
-// See: https://github.com/tendermint/tendermint/issues/4595
+// See: https://github.com/line/ostracon/issues/4595
 type fastSyncReactor interface {
 	SwitchToFastSync(sm.State) error
 }
@@ -210,6 +214,7 @@ type Node struct {
 	proxyApp          proxy.AppConns          // connection to the application
 	rpcListeners      []net.Listener          // rpc servers
 	txIndexer         txindex.TxIndexer
+	blockIndexer      indexer.BlockIndexer
 	indexerService    *txindex.IndexerService
 	prometheusSrv     *http.Server
 }
@@ -248,27 +253,40 @@ func createAndStartEventBus(logger log.Logger) (*types.EventBus, error) {
 	return eventBus, nil
 }
 
-func createAndStartIndexerService(config *cfg.Config, dbProvider DBProvider,
-	eventBus *types.EventBus, logger log.Logger) (*txindex.IndexerService, txindex.TxIndexer, error) {
+func createAndStartIndexerService(
+	config *cfg.Config,
+	dbProvider DBProvider,
+	eventBus *types.EventBus,
+	logger log.Logger,
+) (*txindex.IndexerService, txindex.TxIndexer, indexer.BlockIndexer, error) {
+
+	var (
+		txIndexer    txindex.TxIndexer
+		blockIndexer indexer.BlockIndexer
+	)
 
-	var txIndexer txindex.TxIndexer
 	switch config.TxIndex.Indexer {
 	case "kv":
 		store, err := dbProvider(&DBContext{"tx_index", config})
 		if err != nil {
-			return nil, nil, err
+			return nil, nil, nil, err
 		}
+
 		txIndexer = kv.NewTxIndex(store)
+		blockIndexer = blockidxkv.New(pdbm.NewDB(store, []byte("block_events")))
 	default:
 		txIndexer = &null.TxIndex{}
+		blockIndexer = &blockidxnull.BlockerIndexer{}
 	}
 
-	indexerService := txindex.NewIndexerService(txIndexer, eventBus)
+	indexerService := txindex.NewIndexerService(txIndexer, blockIndexer, eventBus)
 	indexerService.SetLogger(logger.With("module", "txindex"))
+
 	if err := indexerService.Start(); err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
-	return indexerService, txIndexer, nil
+
+	return indexerService, txIndexer, blockIndexer, nil
 }
 
 func doHandshake(
@@ -559,7 +577,7 @@ func createPEXReactorAndAddToSwitch(addrBook pex.AddrBook, config *cfg.Config,
 			// blocks assuming 10s blocks ~ 28 hours.
 			// TODO (melekes): make it dynamic based on the actual block latencies
 			// from the live network.
-			// https://github.com/tendermint/tendermint/issues/3523
+			// https://github.com/line/ostracon/issues/3523
 			SeedDisconnectWaitPeriod:     28 * time.Hour,
 			PersistentPeersMaxDialPeriod: config.P2P.PersistentPeersMaxDialPeriod,
 			RecvBufSize:                  config.P2P.PexRecvBufSize,
@@ -670,8 +688,7 @@ func NewNode(config *cfg.Config,
 		return nil, err
 	}
 
-	// Transaction indexing
-	indexerService, txIndexer, err := createAndStartIndexerService(config, dbProvider, eventBus, logger)
+	indexerService, txIndexer, blockIndexer, err := createAndStartIndexerService(config, dbProvider, eventBus, logger)
 	if err != nil {
 		return nil, err
 	}
@@ -763,7 +780,7 @@ func NewNode(config *cfg.Config,
 	// Set up state sync reactor, and schedule a sync if requested.
 	// FIXME The way we do phased startups (e.g. replay -> fast sync -> consensus) is very messy,
 	// we should clean this whole thing up. See:
-	// https://github.com/tendermint/tendermint/issues/4644
+	// https://github.com/line/ostracon/issues/4644
 	stateSyncReactor := statesync.NewReactor(proxyApp.Snapshot(), proxyApp.Query(),
 		config.P2P.RecvAsync, config.P2P.StatesyncRecvBufSize)
 	stateSyncReactor.SetLogger(logger.With("module", "statesync"))
@@ -848,6 +865,7 @@ func NewNode(config *cfg.Config,
 		proxyApp:         proxyApp,
 		txIndexer:        txIndexer,
 		indexerService:   indexerService,
+		blockIndexer:     blockIndexer,
 		eventBus:         eventBus,
 	}
 	node.BaseService = *service.NewBaseService(logger, "Node", node)
@@ -1004,6 +1022,7 @@ func (n *Node) ConfigureRPC() error {
 		PubKey:           pubKey,
 		GenDoc:           n.genesisDoc,
 		TxIndexer:        n.txIndexer,
+		BlockIndexer:     n.blockIndexer,
 		ConsensusReactor: n.consensusReactor,
 		EventBus:         n.eventBus,
 		Mempool:          n.mempool,
@@ -1036,7 +1055,7 @@ func (n *Node) startRPC() ([]net.Listener, error) {
 	config.IdleTimeout = n.config.RPC.IdleTimeout
 	// If necessary adjust global WriteTimeout to ensure it's greater than
 	// TimeoutBroadcastTxCommit.
-	// See https://github.com/tendermint/tendermint/issues/3435
+	// See https://github.com/line/ostracon/issues/3435
 	if config.WriteTimeout <= n.config.RPC.TimeoutBroadcastTxCommit {
 		config.WriteTimeout = n.config.RPC.TimeoutBroadcastTxCommit + 1*time.Second
 	}
@@ -1115,7 +1134,7 @@ func (n *Node) startRPC() ([]net.Listener, error) {
 		config.MaxOpenConnections = n.config.RPC.GRPCMaxOpenConnections
 		// If necessary adjust global WriteTimeout to ensure it's greater than
 		// TimeoutBroadcastTxCommit.
-		// See https://github.com/tendermint/tendermint/issues/3435
+		// See https://github.com/line/ostracon/issues/3435
 		if config.WriteTimeout <= n.config.RPC.TimeoutBroadcastTxCommit {
 			config.WriteTimeout = n.config.RPC.TimeoutBroadcastTxCommit + 1*time.Second
 		}
diff --git a/rpc/client/http/http.go b/rpc/client/http/http.go
index d83a2b000..834a04940 100644
--- a/rpc/client/http/http.go
+++ b/rpc/client/http/http.go
@@ -468,24 +468,55 @@ func (c *baseRPCClient) TxSearch(
 	page,
 	perPage *int,
 	orderBy string,
-) (
-	*ctypes.ResultTxSearch, error) {
+) (*ctypes.ResultTxSearch, error) {
+
 	result := new(ctypes.ResultTxSearch)
 	params := map[string]interface{}{
 		"query":    query,
 		"prove":    prove,
 		"order_by": orderBy,
 	}
+
 	if page != nil {
 		params["page"] = page
 	}
 	if perPage != nil {
 		params["per_page"] = perPage
 	}
+
 	_, err := c.caller.Call(ctx, "tx_search", params, result)
 	if err != nil {
 		return nil, err
 	}
+
+	return result, nil
+}
+
+func (c *baseRPCClient) BlockSearch(
+	ctx context.Context,
+	query string,
+	page, perPage *int,
+	orderBy string,
+) (*ctypes.ResultBlockSearch, error) {
+
+	result := new(ctypes.ResultBlockSearch)
+	params := map[string]interface{}{
+		"query":    query,
+		"order_by": orderBy,
+	}
+
+	if page != nil {
+		params["page"] = page
+	}
+	if perPage != nil {
+		params["per_page"] = perPage
+	}
+
+	_, err := c.caller.Call(ctx, "block_search", params, result)
+	if err != nil {
+		return nil, err
+	}
+
 	return result, nil
 }
 
diff --git a/rpc/client/interface.go b/rpc/client/interface.go
index de4a56173..e70b165c5 100644
--- a/rpc/client/interface.go
+++ b/rpc/client/interface.go
@@ -72,8 +72,25 @@ type SignClient interface {
 	Validators(ctx context.Context, height *int64, page, perPage *int) (*ctypes.ResultValidators, error)
 	Voters(ctx context.Context, height *int64, page, perPage *int) (*ctypes.ResultVoters, error)
 	Tx(ctx context.Context, hash []byte, prove bool) (*ctypes.ResultTx, error)
-	TxSearch(ctx context.Context, query string, prove bool, page, perPage *int,
-		orderBy string) (*ctypes.ResultTxSearch, error)
+
+	// TxSearch defines a method to search for a paginated set of transactions by
+	// DeliverTx event search criteria.
+	TxSearch(
+		ctx context.Context,
+		query string,
+		prove bool,
+		page, perPage *int,
+		orderBy string,
+	) (*ctypes.ResultTxSearch, error)
+
+	// BlockSearch defines a method to search for a paginated set of blocks by
+	// BeginBlock and EndBlock event search criteria.
+	BlockSearch(
+		ctx context.Context,
+		query string,
+		page, perPage *int,
+		orderBy string,
+	) (*ctypes.ResultBlockSearch, error)
 }
 
 // HistoryClient provides access to data from genesis to now in large chunks.
diff --git a/rpc/client/local/local.go b/rpc/client/local/local.go
index 6e2b66ac5..fb00e2d76 100644
--- a/rpc/client/local/local.go
+++ b/rpc/client/local/local.go
@@ -182,7 +182,7 @@ func (c *Local) Tx(ctx context.Context, hash []byte, prove bool) (*ctypes.Result
 }
 
 func (c *Local) TxSearch(
-	ctx context.Context,
+	_ context.Context,
 	query string,
 	prove bool,
 	page,
@@ -192,6 +192,15 @@ func (c *Local) TxSearch(
 	return core.TxSearch(c.ctx, query, prove, page, perPage, orderBy)
 }
 
+func (c *Local) BlockSearch(
+	_ context.Context,
+	query string,
+	page, perPage *int,
+	orderBy string,
+) (*ctypes.ResultBlockSearch, error) {
+	return core.BlockSearch(c.ctx, query, page, perPage, orderBy)
+}
+
 func (c *Local) BroadcastEvidence(ctx context.Context, ev types.Evidence) (*ctypes.ResultBroadcastEvidence, error) {
 	return core.BroadcastEvidence(c.ctx, ev)
 }
diff --git a/rpc/client/mocks/client.go b/rpc/client/mocks/client.go
index 990c5e846..1881a3b92 100644
--- a/rpc/client/mocks/client.go
+++ b/rpc/client/mocks/client.go
@@ -160,6 +160,29 @@ func (_m *Client) BlockResults(ctx context.Context, height *int64) (*coretypes.R
 	return r0, r1
 }
 
+// BlockSearch provides a mock function with given fields: ctx, query, page, perPage, orderBy
+func (_m *Client) BlockSearch(ctx context.Context, query string, page *int, perPage *int, orderBy string) (*coretypes.ResultBlockSearch, error) {
+	ret := _m.Called(ctx, query, page, perPage, orderBy)
+
+	var r0 *coretypes.ResultBlockSearch
+	if rf, ok := ret.Get(0).(func(context.Context, string, *int, *int, string) *coretypes.ResultBlockSearch); ok {
+		r0 = rf(ctx, query, page, perPage, orderBy)
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(*coretypes.ResultBlockSearch)
+		}
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(context.Context, string, *int, *int, string) error); ok {
+		r1 = rf(ctx, query, page, perPage, orderBy)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
 // BlockchainInfo provides a mock function with given fields: ctx, minHeight, maxHeight
 func (_m *Client) BlockchainInfo(ctx context.Context, minHeight int64, maxHeight int64) (*coretypes.ResultBlockchainInfo, error) {
 	ret := _m.Called(ctx, minHeight, maxHeight)
diff --git a/rpc/core/blocks.go b/rpc/core/blocks.go
index f980aee8d..a8f44d04b 100644
--- a/rpc/core/blocks.go
+++ b/rpc/core/blocks.go
@@ -1,11 +1,15 @@
 package core
 
 import (
+	"errors"
 	"fmt"
+	"sort"
 
 	tmmath "github.com/line/ostracon/libs/math"
+	tmquery "github.com/line/ostracon/libs/pubsub/query"
 	ctypes "github.com/line/ostracon/rpc/core/types"
 	rpctypes "github.com/line/ostracon/rpc/jsonrpc/types"
+	blockidxnull "github.com/line/ostracon/state/indexer/block/null"
 	"github.com/line/ostracon/types"
 )
 
@@ -154,3 +158,68 @@ func BlockResults(ctx *rpctypes.Context, heightPtr *int64) (*ctypes.ResultBlockR
 		ConsensusParamUpdates: results.EndBlock.ConsensusParamUpdates,
 	}, nil
 }
+
+// BlockSearch searches for a paginated set of blocks matching BeginBlock and
+// EndBlock event search criteria.
+func BlockSearch(
+	ctx *rpctypes.Context,
+	query string,
+	pagePtr, perPagePtr *int,
+	orderBy string,
+) (*ctypes.ResultBlockSearch, error) {
+
+	// skip if block indexing is disabled
+	if _, ok := env.BlockIndexer.(*blockidxnull.BlockerIndexer); ok {
+		return nil, errors.New("block indexing is disabled")
+	}
+
+	q, err := tmquery.New(query)
+	if err != nil {
+		return nil, err
+	}
+
+	results, err := env.BlockIndexer.Search(ctx.Context(), q)
+	if err != nil {
+		return nil, err
+	}
+
+	// sort results (must be done before pagination)
+	switch orderBy {
+	case "desc", "":
+		sort.Slice(results, func(i, j int) bool { return results[i] > results[j] })
+
+	case "asc":
+		sort.Slice(results, func(i, j int) bool { return results[i] < results[j] })
+
+	default:
+		return nil, errors.New("expected order_by to be either `asc` or `desc` or empty")
+	}
+
+	// paginate results
+	totalCount := len(results)
+	perPage := validatePerPage(perPagePtr)
+
+	page, err := validatePage(pagePtr, perPage, totalCount)
+	if err != nil {
+		return nil, err
+	}
+
+	skipCount := validateSkipCount(page, perPage)
+	pageSize := tmmath.MinInt(perPage, totalCount-skipCount)
+
+	apiResults := make([]*ctypes.ResultBlock, 0, pageSize)
+	for i := skipCount; i < skipCount+pageSize; i++ {
+		block := env.BlockStore.LoadBlock(results[i])
+		if block != nil {
+			blockMeta := env.BlockStore.LoadBlockMeta(block.Height)
+			if blockMeta != nil {
+				apiResults = append(apiResults, &ctypes.ResultBlock{
+					Block:   block,
+					BlockID: blockMeta.BlockID,
+				})
+			}
+		}
+	}
+
+	return &ctypes.ResultBlockSearch{Blocks: apiResults, TotalCount: totalCount}, nil
+}
diff --git a/rpc/core/env.go b/rpc/core/env.go
index 6016c4fba..945a9c6d3 100644
--- a/rpc/core/env.go
+++ b/rpc/core/env.go
@@ -12,6 +12,7 @@ import (
 	"github.com/line/ostracon/p2p"
 	"github.com/line/ostracon/proxy"
 	sm "github.com/line/ostracon/state"
+	"github.com/line/ostracon/state/indexer"
 	"github.com/line/ostracon/state/txindex"
 	"github.com/line/ostracon/types"
 )
@@ -85,6 +86,7 @@ type Environment struct {
 	PubKey           crypto.PubKey
 	GenDoc           *types.GenesisDoc // cache the genesis structure
 	TxIndexer        txindex.TxIndexer
+	BlockIndexer     indexer.BlockIndexer
 	ConsensusReactor *consensus.Reactor
 	EventBus         *types.EventBus // thread safe
 	Mempool          mempl.Mempool
diff --git a/rpc/core/routes.go b/rpc/core/routes.go
index 0381e7657..af0974043 100644
--- a/rpc/core/routes.go
+++ b/rpc/core/routes.go
@@ -26,6 +26,7 @@ var Routes = map[string]*rpc.RPCFunc{
 	"check_tx":             rpc.NewRPCFunc(CheckTx, "tx"),
 	"tx":                   rpc.NewRPCFunc(Tx, "hash,prove"),
 	"tx_search":            rpc.NewRPCFunc(TxSearch, "query,prove,page,per_page,order_by"),
+	"block_search":         rpc.NewRPCFunc(BlockSearch, "query,page,per_page,order_by"),
 	"validators":           rpc.NewRPCFunc(Validators, "height,page,per_page"),
 	"voters":               rpc.NewRPCFunc(Voters, "height,page,per_page"),
 	"dump_consensus_state": rpc.NewRPCFunc(DumpConsensusState, ""),
diff --git a/rpc/core/tx.go b/rpc/core/tx.go
index ce0a08632..792822902 100644
--- a/rpc/core/tx.go
+++ b/rpc/core/tx.go
@@ -54,8 +54,14 @@ func Tx(ctx *rpctypes.Context, hash []byte, prove bool) (*ctypes.ResultTx, error
 // TxSearch allows you to query for multiple transactions results. It returns a
 // list of transactions (maximum ?per_page entries) and the total count.
 // More: https://docs.tendermint.com/master/rpc/#/Info/tx_search
-func TxSearch(ctx *rpctypes.Context, query string, prove bool, pagePtr, perPagePtr *int, orderBy string) (
-	*ctypes.ResultTxSearch, error) {
+func TxSearch(
+	ctx *rpctypes.Context,
+	query string,
+	prove bool,
+	pagePtr, perPagePtr *int,
+	orderBy string,
+) (*ctypes.ResultTxSearch, error) {
+
 	// if index is disabled, return error
 	if _, ok := env.TxIndexer.(*null.TxIndex); ok {
 		return nil, errors.New("transaction indexing is disabled")
@@ -94,10 +100,12 @@ func TxSearch(ctx *rpctypes.Context, query string, prove bool, pagePtr, perPageP
 	// paginate results
 	totalCount := len(results)
 	perPage := validatePerPage(perPagePtr)
+
 	page, err := validatePage(pagePtr, perPage, totalCount)
 	if err != nil {
 		return nil, err
 	}
+
 	skipCount := validateSkipCount(page, perPage)
 	pageSize := tmmath.MinInt(perPage, totalCount-skipCount)
 
diff --git a/rpc/core/types/responses.go b/rpc/core/types/responses.go
index c69a087ec..2eeda5e3d 100644
--- a/rpc/core/types/responses.go
+++ b/rpc/core/types/responses.go
@@ -206,6 +206,12 @@ type ResultTxSearch struct {
 	TotalCount int         `json:"total_count"`
 }
 
+// ResultBlockSearch defines the RPC response type for a block search by events.
+type ResultBlockSearch struct {
+	Blocks     []*ResultBlock `json:"blocks"`
+	TotalCount int            `json:"total_count"`
+}
+
 // List of mempool txs
 type ResultUnconfirmedTxs struct {
 	Count      int        `json:"n_txs"`
diff --git a/rpc/openapi/openapi.yaml b/rpc/openapi/openapi.yaml
index dbc5d3069..b6f6451c0 100644
--- a/rpc/openapi/openapi.yaml
+++ b/rpc/openapi/openapi.yaml
@@ -1014,6 +1014,62 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/ErrorResponse"
+  /block_search:
+    get:
+      summary: Search for blocks by BeginBlock and EndBlock events
+      description: |
+        Search for blocks by BeginBlock and EndBlock events.
+
+        See /subscribe for the query syntax.
+      operationId: block_search
+      parameters:
+        - in: query
+          name: query
+          description: Query
+          required: true
+          schema:
+            type: string
+            example: "block.height > 1000 AND valset.changed > 0"
+        - in: query
+          name: page
+          description: "Page number (1-based)"
+          required: false
+          schema:
+            type: integer
+            default: 1
+            example: 1
+        - in: query
+          name: per_page
+          description: "Number of entries per page (max: 100)"
+          required: false
+          schema:
+            type: integer
+            default: 30
+            example: 30
+        - in: query
+          name: order_by
+          description: Order in which blocks are sorted ("asc" or "desc"), by height. If empty, default sorting will be still applied.
+          required: false
+          schema:
+            type: string
+            default: "desc"
+            example: "asc"
+      tags:
+        - Info
+      responses:
+        "200":
+          description: List of paginated blocks matching the search criteria.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/BlockSearchResponse"
+        "500":
+          description: Error
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/ErrorResponse"
+
   /tx:
     get:
       summary: Get transactions by hash
diff --git a/state/indexer/block.go b/state/indexer/block.go
new file mode 100644
index 000000000..941705d2f
--- /dev/null
+++ b/state/indexer/block.go
@@ -0,0 +1,22 @@
+package indexer
+
+import (
+	"context"
+
+	"github.com/line/ostracon/libs/pubsub/query"
+	"github.com/line/ostracon/types"
+)
+
+// BlockIndexer defines an interface contract for indexing block events.
+type BlockIndexer interface {
+	// Has returns true if the given height has been indexed. An error is returned
+	// upon database query failure.
+	Has(height int64) (bool, error)
+
+	// Index indexes BeginBlock and EndBlock events for a given block by its height.
+	Index(types.EventDataNewBlockHeader) error
+
+	// Search performs a query for block heights that match a given BeginBlock
+	// and Endblock event search criteria.
+	Search(ctx context.Context, q *query.Query) ([]int64, error)
+}
diff --git a/state/indexer/block/kv/kv.go b/state/indexer/block/kv/kv.go
new file mode 100644
index 000000000..799a2434c
--- /dev/null
+++ b/state/indexer/block/kv/kv.go
@@ -0,0 +1,489 @@
+package kv
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sort"
+	"strconv"
+	"strings"
+
+	"github.com/google/orderedcode"
+	db "github.com/line/tm-db/v2"
+
+	abci "github.com/line/ostracon/abci/types"
+	"github.com/line/ostracon/libs/pubsub/query"
+	"github.com/line/ostracon/state/indexer"
+	"github.com/line/ostracon/types"
+)
+
+var _ indexer.BlockIndexer = (*BlockerIndexer)(nil)
+
+// BlockerIndexer implements a block indexer, indexing BeginBlock and EndBlock
+// events with an underlying KV store. Block events are indexed by their height,
+// such that matching search criteria returns the respective block height(s).
+type BlockerIndexer struct {
+	store db.DB
+}
+
+func New(store db.DB) *BlockerIndexer {
+	return &BlockerIndexer{
+		store: store,
+	}
+}
+
+// Has returns true if the given height has been indexed. An error is returned
+// upon database query failure.
+func (idx *BlockerIndexer) Has(height int64) (bool, error) {
+	key, err := heightKey(height)
+	if err != nil {
+		return false, fmt.Errorf("failed to create block height index key: %w", err)
+	}
+
+	return idx.store.Has(key)
+}
+
+// Index indexes BeginBlock and EndBlock events for a given block by its height.
+// The following is indexed:
+//
+// primary key: encode(block.height | height) => encode(height)
+// BeginBlock events: encode(eventType.eventAttr|eventValue|height|begin_block) => encode(height)
+// EndBlock events: encode(eventType.eventAttr|eventValue|height|end_block) => encode(height)
+func (idx *BlockerIndexer) Index(bh types.EventDataNewBlockHeader) error {
+	batch := idx.store.NewBatch()
+	defer batch.Close()
+
+	height := bh.Header.Height
+
+	// 1. index by height
+	key, err := heightKey(height)
+	if err != nil {
+		return fmt.Errorf("failed to create block height index key: %w", err)
+	}
+	if err := batch.Set(key, int64ToBytes(height)); err != nil {
+		return err
+	}
+
+	// 2. index BeginBlock events
+	if err := idx.indexEvents(batch, bh.ResultBeginBlock.Events, "begin_block", height); err != nil {
+		return fmt.Errorf("failed to index BeginBlock events: %w", err)
+	}
+
+	// 3. index EndBlock events
+	if err := idx.indexEvents(batch, bh.ResultEndBlock.Events, "end_block", height); err != nil {
+		return fmt.Errorf("failed to index EndBlock events: %w", err)
+	}
+
+	return batch.WriteSync()
+}
+
+// Search performs a query for block heights that match a given BeginBlock
+// and Endblock event search criteria. The given query can match against zero,
+// one or more block heights. In the case of height queries, i.e. block.height=H,
+// if the height is indexed, that height alone will be returned. An error and
+// nil slice is returned. Otherwise, a non-nil slice and nil error is returned.
+func (idx *BlockerIndexer) Search(ctx context.Context, q *query.Query) ([]int64, error) {
+	results := make([]int64, 0)
+	select {
+	case <-ctx.Done():
+		return results, nil
+
+	default:
+	}
+
+	conditions, err := q.Conditions()
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse query conditions: %w", err)
+	}
+
+	// If there is an exact height query, return the result immediately
+	// (if it exists).
+	height, ok := lookForHeight(conditions)
+	if ok {
+		ok, err := idx.Has(height)
+		if err != nil {
+			return nil, err
+		}
+
+		if ok {
+			return []int64{height}, nil
+		}
+
+		return results, nil
+	}
+
+	var heightsInitialized bool
+	filteredHeights := make(map[string][]byte)
+
+	// conditions to skip because they're handled before "everything else"
+	skipIndexes := make([]int, 0)
+
+	// Extract ranges. If both upper and lower bounds exist, it's better to get
+	// them in order as to not iterate over kvs that are not within range.
+	ranges, rangeIndexes := indexer.LookForRanges(conditions)
+	if len(ranges) > 0 {
+		skipIndexes = append(skipIndexes, rangeIndexes...)
+
+		for _, qr := range ranges {
+			prefix, err := orderedcode.Append(nil, qr.Key)
+			if err != nil {
+				return nil, fmt.Errorf("failed to create prefix key: %w", err)
+			}
+
+			if !heightsInitialized {
+				filteredHeights, err = idx.matchRange(ctx, qr, prefix, filteredHeights, true)
+				if err != nil {
+					return nil, err
+				}
+
+				heightsInitialized = true
+
+				// Ignore any remaining conditions if the first condition resulted in no
+				// matches (assuming implicit AND operand).
+				if len(filteredHeights) == 0 {
+					break
+				}
+			} else {
+				filteredHeights, err = idx.matchRange(ctx, qr, prefix, filteredHeights, false)
+				if err != nil {
+					return nil, err
+				}
+			}
+		}
+	}
+
+	// for all other conditions
+	for i, c := range conditions {
+		if intInSlice(i, skipIndexes) {
+			continue
+		}
+
+		startKey, err := orderedcode.Append(nil, c.CompositeKey, fmt.Sprintf("%v", c.Operand))
+		if err != nil {
+			return nil, err
+		}
+
+		if !heightsInitialized {
+			filteredHeights, err = idx.match(ctx, c, startKey, filteredHeights, true)
+			if err != nil {
+				return nil, err
+			}
+
+			heightsInitialized = true
+
+			// Ignore any remaining conditions if the first condition resulted in no
+			// matches (assuming implicit AND operand).
+			if len(filteredHeights) == 0 {
+				break
+			}
+		} else {
+			filteredHeights, err = idx.match(ctx, c, startKey, filteredHeights, false)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	// fetch matching heights
+	results = make([]int64, 0, len(filteredHeights))
+	for _, hBz := range filteredHeights {
+		h := int64FromBytes(hBz)
+
+		ok, err := idx.Has(h)
+		if err != nil {
+			return nil, err
+		}
+		if ok {
+			results = append(results, h)
+		}
+
+		select {
+		case <-ctx.Done():
+			break
+
+		default:
+		}
+	}
+
+	sort.Slice(results, func(i, j int) bool { return results[i] < results[j] })
+
+	return results, nil
+}
+
+// matchRange returns all matching block heights that match a given QueryRange
+// and start key. An already filtered result (filteredHeights) is provided such
+// that any non-intersecting matches are removed.
+//
+// NOTE: The provided filteredHeights may be empty if no previous condition has
+// matched.
+func (idx *BlockerIndexer) matchRange(
+	ctx context.Context,
+	qr indexer.QueryRange,
+	startKey []byte,
+	filteredHeights map[string][]byte,
+	firstRun bool,
+) (map[string][]byte, error) {
+
+	// A previous match was attempted but resulted in no matches, so we return
+	// no matches (assuming AND operand).
+	if !firstRun && len(filteredHeights) == 0 {
+		return filteredHeights, nil
+	}
+
+	tmpHeights := make(map[string][]byte)
+	lowerBound := qr.LowerBoundValue()
+	upperBound := qr.UpperBoundValue()
+
+	it, err := idx.store.PrefixIterator(startKey)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
+	}
+	defer it.Close()
+
+LOOP:
+	for ; it.Valid(); it.Next() {
+		var (
+			eventValue string
+			err        error
+		)
+
+		if qr.Key == types.BlockHeightKey {
+			eventValue, err = parseValueFromPrimaryKey(it.Key())
+		} else {
+			eventValue, err = parseValueFromEventKey(it.Key())
+		}
+
+		if err != nil {
+			continue
+		}
+
+		if _, ok := qr.AnyBound().(int64); ok {
+			v, err := strconv.ParseInt(eventValue, 10, 64)
+			if err != nil {
+				continue LOOP
+			}
+
+			include := true
+			if lowerBound != nil && v < lowerBound.(int64) {
+				include = false
+			}
+
+			if upperBound != nil && v > upperBound.(int64) {
+				include = false
+			}
+
+			if include {
+				tmpHeights[string(it.Value())] = it.Value()
+			}
+		}
+
+		select {
+		case <-ctx.Done():
+			break
+
+		default:
+		}
+	}
+
+	if err := it.Error(); err != nil {
+		return nil, err
+	}
+
+	if len(tmpHeights) == 0 || firstRun {
+		// Either:
+		//
+		// 1. Regardless if a previous match was attempted, which may have had
+		// results, but no match was found for the current condition, then we
+		// return no matches (assuming AND operand).
+		//
+		// 2. A previous match was not attempted, so we return all results.
+		return tmpHeights, nil
+	}
+
+	// Remove/reduce matches in filteredHashes that were not found in this
+	// match (tmpHashes).
+	for k := range filteredHeights {
+		if tmpHeights[k] == nil {
+			delete(filteredHeights, k)
+
+			select {
+			case <-ctx.Done():
+				break
+
+			default:
+			}
+		}
+	}
+
+	return filteredHeights, nil
+}
+
+// match returns all matching heights that meet a given query condition and start
+// key. An already filtered result (filteredHeights) is provided such that any
+// non-intersecting matches are removed.
+//
+// NOTE: The provided filteredHeights may be empty if no previous condition has
+// matched.
+func (idx *BlockerIndexer) match(
+	ctx context.Context,
+	c query.Condition,
+	startKeyBz []byte,
+	filteredHeights map[string][]byte,
+	firstRun bool,
+) (map[string][]byte, error) {
+
+	// A previous match was attempted but resulted in no matches, so we return
+	// no matches (assuming AND operand).
+	if !firstRun && len(filteredHeights) == 0 {
+		return filteredHeights, nil
+	}
+
+	tmpHeights := make(map[string][]byte)
+
+	switch {
+	case c.Op == query.OpEqual:
+		it, err := idx.store.PrefixIterator(startKeyBz)
+		if err != nil {
+			return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
+		}
+		defer it.Close()
+
+		for ; it.Valid(); it.Next() {
+			tmpHeights[string(it.Value())] = it.Value()
+
+			if err := ctx.Err(); err != nil {
+				break
+			}
+		}
+
+		if err := it.Error(); err != nil {
+			return nil, err
+		}
+
+	case c.Op == query.OpExists:
+		prefix, err := orderedcode.Append(nil, c.CompositeKey)
+		if err != nil {
+			return nil, err
+		}
+
+		it, err := idx.store.PrefixIterator(prefix)
+		if err != nil {
+			return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
+		}
+		defer it.Close()
+
+		for ; it.Valid(); it.Next() {
+			tmpHeights[string(it.Value())] = it.Value()
+
+			select {
+			case <-ctx.Done():
+				break
+
+			default:
+			}
+		}
+
+		if err := it.Error(); err != nil {
+			return nil, err
+		}
+
+	case c.Op == query.OpContains:
+		prefix, err := orderedcode.Append(nil, c.CompositeKey)
+		if err != nil {
+			return nil, err
+		}
+
+		it, err := idx.store.PrefixIterator(prefix)
+		if err != nil {
+			return nil, fmt.Errorf("failed to create prefix iterator: %w", err)
+		}
+		defer it.Close()
+
+		for ; it.Valid(); it.Next() {
+			eventValue, err := parseValueFromEventKey(it.Key())
+			if err != nil {
+				continue
+			}
+
+			if strings.Contains(eventValue, c.Operand.(string)) {
+				tmpHeights[string(it.Value())] = it.Value()
+			}
+
+			select {
+			case <-ctx.Done():
+				break
+
+			default:
+			}
+		}
+		if err := it.Error(); err != nil {
+			return nil, err
+		}
+
+	default:
+		return nil, errors.New("other operators should be handled already")
+	}
+
+	if len(tmpHeights) == 0 || firstRun {
+		// Either:
+		//
+		// 1. Regardless if a previous match was attempted, which may have had
+		// results, but no match was found for the current condition, then we
+		// return no matches (assuming AND operand).
+		//
+		// 2. A previous match was not attempted, so we return all results.
+		return tmpHeights, nil
+	}
+
+	// Remove/reduce matches in filteredHeights that were not found in this
+	// match (tmpHeights).
+	for k := range filteredHeights {
+		if tmpHeights[k] == nil {
+			delete(filteredHeights, k)
+
+			select {
+			case <-ctx.Done():
+				break
+
+			default:
+			}
+		}
+	}
+
+	return filteredHeights, nil
+}
+
+func (idx *BlockerIndexer) indexEvents(batch db.Batch, events []abci.Event, typ string, height int64) error {
+	heightBz := int64ToBytes(height)
+
+	for _, event := range events {
+		// only index events with a non-empty type
+		if len(event.Type) == 0 {
+			continue
+		}
+
+		for _, attr := range event.Attributes {
+			if len(attr.Key) == 0 {
+				continue
+			}
+
+			// index iff the event specified index:true and it's not a reserved event
+			compositeKey := fmt.Sprintf("%s.%s", event.Type, string(attr.Key))
+			if compositeKey == types.TxHashKey || compositeKey == types.TxHeightKey {
+				return fmt.Errorf("event type and attribute key \"%s\" is reserved; please use a different key", compositeKey)
+			}
+			if attr.GetIndex() {
+				key, err := eventKey(compositeKey, typ, string(attr.Value), height)
+				if err != nil {
+					return fmt.Errorf("failed to create block index key: %w", err)
+				}
+
+				if err := batch.Set(key, heightBz); err != nil {
+					return err
+				}
+			}
+		}
+	}
+
+	return nil
+}
diff --git a/state/indexer/block/kv/kv_test.go b/state/indexer/block/kv/kv_test.go
new file mode 100644
index 000000000..4239e6c43
--- /dev/null
+++ b/state/indexer/block/kv/kv_test.go
@@ -0,0 +1,141 @@
+package kv_test
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	abci "github.com/line/ostracon/abci/types"
+	"github.com/line/ostracon/libs/pubsub/query"
+	blockidxkv "github.com/line/ostracon/state/indexer/block/kv"
+	"github.com/line/ostracon/types"
+	dbm "github.com/line/tm-db/v2/memdb"
+	dbp "github.com/line/tm-db/v2/prefixdb"
+	"github.com/stretchr/testify/require"
+)
+
+func TestBlockIndexer(t *testing.T) {
+	store := dbp.NewDB(dbm.NewDB(), []byte("block_events"))
+	indexer := blockidxkv.New(store)
+	require.NoError(t, indexer.Index(types.EventDataNewBlockHeader{
+		Header: types.Header{Height: 1},
+		ResultBeginBlock: abci.ResponseBeginBlock{
+			Events: []abci.Event{
+				{
+					Type: "begin_event",
+					Attributes: []abci.EventAttribute{
+						{
+							Key:   []byte("proposer"),
+							Value: []byte("FCAA001"),
+							Index: true,
+						},
+					},
+				},
+			},
+		},
+		ResultEndBlock: abci.ResponseEndBlock{
+			Events: []abci.Event{
+				{
+					Type: "end_event",
+					Attributes: []abci.EventAttribute{
+						{
+							Key:   []byte("foo"),
+							Value: []byte("100"),
+							Index: true,
+						},
+					},
+				},
+			},
+		},
+	}))
+
+	for i := 2; i < 12; i++ {
+		var index bool
+		if i%2 == 0 {
+			index = true
+		}
+
+		require.NoError(t, indexer.Index(types.EventDataNewBlockHeader{
+			Header: types.Header{Height: int64(i)},
+			ResultBeginBlock: abci.ResponseBeginBlock{
+				Events: []abci.Event{
+					{
+						Type: "begin_event",
+						Attributes: []abci.EventAttribute{
+							{
+								Key:   []byte("proposer"),
+								Value: []byte("FCAA001"),
+								Index: true,
+							},
+						},
+					},
+				},
+			},
+			ResultEndBlock: abci.ResponseEndBlock{
+				Events: []abci.Event{
+					{
+						Type: "end_event",
+						Attributes: []abci.EventAttribute{
+							{
+								Key:   []byte("foo"),
+								Value: []byte(fmt.Sprintf("%d", i)),
+								Index: index,
+							},
+						},
+					},
+				},
+			},
+		}))
+	}
+
+	testCases := map[string]struct {
+		q       *query.Query
+		results []int64
+	}{
+		"block.height = 100": {
+			q:       query.MustParse("block.height = 100"),
+			results: []int64{},
+		},
+		"block.height = 5": {
+			q:       query.MustParse("block.height = 5"),
+			results: []int64{5},
+		},
+		"begin_event.key1 = 'value1'": {
+			q:       query.MustParse("begin_event.key1 = 'value1'"),
+			results: []int64{},
+		},
+		"begin_event.proposer = 'FCAA001'": {
+			q:       query.MustParse("begin_event.proposer = 'FCAA001'"),
+			results: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11},
+		},
+		"end_event.foo <= 5": {
+			q:       query.MustParse("end_event.foo <= 5"),
+			results: []int64{2, 4},
+		},
+		"end_event.foo >= 100": {
+			q:       query.MustParse("end_event.foo >= 100"),
+			results: []int64{1},
+		},
+		"block.height > 2 AND end_event.foo <= 8": {
+			q:       query.MustParse("block.height > 2 AND end_event.foo <= 8"),
+			results: []int64{4, 6, 8},
+		},
+		"begin_event.proposer CONTAINS 'FFFFFFF'": {
+			q:       query.MustParse("begin_event.proposer CONTAINS 'FFFFFFF'"),
+			results: []int64{},
+		},
+		"begin_event.proposer CONTAINS 'FCAA001'": {
+			q:       query.MustParse("begin_event.proposer CONTAINS 'FCAA001'"),
+			results: []int64{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11},
+		},
+	}
+
+	for name, tc := range testCases {
+		tc := tc
+		t.Run(name, func(t *testing.T) {
+			results, err := indexer.Search(context.Background(), tc.q)
+			require.NoError(t, err)
+			require.Equal(t, tc.results, results)
+		})
+	}
+}
diff --git a/state/indexer/block/kv/util.go b/state/indexer/block/kv/util.go
new file mode 100644
index 000000000..fe96158e7
--- /dev/null
+++ b/state/indexer/block/kv/util.go
@@ -0,0 +1,96 @@
+package kv
+
+import (
+	"encoding/binary"
+	"fmt"
+	"strconv"
+
+	"github.com/google/orderedcode"
+	"github.com/line/ostracon/libs/pubsub/query"
+	"github.com/line/ostracon/types"
+)
+
+func intInSlice(a int, list []int) bool {
+	for _, b := range list {
+		if b == a {
+			return true
+		}
+	}
+
+	return false
+}
+
+func int64FromBytes(bz []byte) int64 {
+	v, _ := binary.Varint(bz)
+	return v
+}
+
+func int64ToBytes(i int64) []byte {
+	buf := make([]byte, binary.MaxVarintLen64)
+	n := binary.PutVarint(buf, i)
+	return buf[:n]
+}
+
+func heightKey(height int64) ([]byte, error) {
+	return orderedcode.Append(
+		nil,
+		types.BlockHeightKey,
+		height,
+	)
+}
+
+func eventKey(compositeKey, typ, eventValue string, height int64) ([]byte, error) {
+	return orderedcode.Append(
+		nil,
+		compositeKey,
+		eventValue,
+		height,
+		typ,
+	)
+}
+
+func parseValueFromPrimaryKey(key []byte) (string, error) {
+	var (
+		compositeKey string
+		height       int64
+	)
+
+	remaining, err := orderedcode.Parse(string(key), &compositeKey, &height)
+	if err != nil {
+		return "", fmt.Errorf("failed to parse event key: %w", err)
+	}
+
+	if len(remaining) != 0 {
+		return "", fmt.Errorf("unexpected remainder in key: %s", remaining)
+	}
+
+	return strconv.FormatInt(height, 10), nil
+}
+
+func parseValueFromEventKey(key []byte) (string, error) {
+	var (
+		compositeKey, typ, eventValue string
+		height                        int64
+	)
+
+	remaining, err := orderedcode.Parse(string(key), &compositeKey, &eventValue, &height, &typ)
+	if err != nil {
+		return "", fmt.Errorf("failed to parse event key: %w", err)
+	}
+
+	if len(remaining) != 0 {
+		return "", fmt.Errorf("unexpected remainder in key: %s", remaining)
+	}
+
+	return eventValue, nil
+}
+
+func lookForHeight(conditions []query.Condition) (int64, bool) {
+	for _, c := range conditions {
+		if c.CompositeKey == types.BlockHeightKey && c.Op == query.OpEqual {
+			return c.Operand.(int64), true
+		}
+	}
+
+	return 0, false
+}
diff --git a/state/indexer/block/null/null.go b/state/indexer/block/null/null.go
new file mode 100644
index 000000000..ea833ac6a
--- /dev/null
+++ b/state/indexer/block/null/null.go
@@ -0,0 +1,27 @@
+package null
+
+import (
+	"context"
+	"errors"
+
+	"github.com/line/ostracon/libs/pubsub/query"
+	"github.com/line/ostracon/state/indexer"
+	"github.com/line/ostracon/types"
+)
+
+var _ indexer.BlockIndexer = (*BlockerIndexer)(nil)
+
+// TxIndex implements a no-op block indexer.
+type BlockerIndexer struct{}
+
+func (idx *BlockerIndexer) Has(height int64) (bool, error) {
+	return false, errors.New(`indexing is disabled (set 'tx_index = "kv"' in config)`)
+}
+
+func (idx *BlockerIndexer) Index(types.EventDataNewBlockHeader) error {
+	return nil
+}
+
+func (idx *BlockerIndexer) Search(ctx context.Context, q *query.Query) ([]int64, error) {
+	return []int64{}, nil
+}
diff --git a/state/indexer/query_range.go b/state/indexer/query_range.go
new file mode 100644
index 000000000..bcedd176b
--- /dev/null
+++ b/state/indexer/query_range.go
@@ -0,0 +1,123 @@
+package indexer
+
+import (
+	"time"
+
+	"github.com/line/ostracon/libs/pubsub/query"
+)
+
+// QueryRanges defines a mapping between a composite event key and a QueryRange.
+//
+// e.g.account.number => queryRange{lowerBound: 1, upperBound: 5}
+type QueryRanges map[string]QueryRange
+
+// QueryRange defines a range within a query condition.
+type QueryRange struct {
+	LowerBound        interface{} // int || time.Time
+	UpperBound        interface{} // int || time.Time
+	Key               string
+	IncludeLowerBound bool
+	IncludeUpperBound bool
+}
+
+// AnyBound returns either the lower bound if non-nil, otherwise the upper bound.
+func (qr QueryRange) AnyBound() interface{} {
+	if qr.LowerBound != nil {
+		return qr.LowerBound
+	}
+
+	return qr.UpperBound
+}
+
+// LowerBoundValue returns the value for the lower bound. If the lower bound is
+// nil, nil will be returned.
+func (qr QueryRange) LowerBoundValue() interface{} {
+	if qr.LowerBound == nil {
+		return nil
+	}
+
+	if qr.IncludeLowerBound {
+		return qr.LowerBound
+	}
+
+	switch t := qr.LowerBound.(type) {
+	case int64:
+		return t + 1
+
+	case time.Time:
+		return t.Unix() + 1
+
+	default:
+		panic("not implemented")
+	}
+}
+
+// UpperBoundValue returns the value for the upper bound. If the upper bound is
+// nil, nil will be returned.
+func (qr QueryRange) UpperBoundValue() interface{} {
+	if qr.UpperBound == nil {
+		return nil
+	}
+
+	if qr.IncludeUpperBound {
+		return qr.UpperBound
+	}
+
+	switch t := qr.UpperBound.(type) {
+	case int64:
+		return t - 1
+
+	case time.Time:
+		return t.Unix() - 1
+
+	default:
+		panic("not implemented")
+	}
+}
+
+// LookForRanges returns a mapping of QueryRanges and the matching indexes in
+// the provided query conditions.
+func LookForRanges(conditions []query.Condition) (ranges QueryRanges, indexes []int) {
+	ranges = make(QueryRanges)
+	for i, c := range conditions {
+		if IsRangeOperation(c.Op) {
+			r, ok := ranges[c.CompositeKey]
+			if !ok {
+				r = QueryRange{Key: c.CompositeKey}
+			}
+
+			switch c.Op {
+			case query.OpGreater:
+				r.LowerBound = c.Operand
+
+			case query.OpGreaterEqual:
+				r.IncludeLowerBound = true
+				r.LowerBound = c.Operand
+
+			case query.OpLess:
+				r.UpperBound = c.Operand
+
+			case query.OpLessEqual:
+				r.IncludeUpperBound = true
+				r.UpperBound = c.Operand
+			}
+
+			ranges[c.CompositeKey] = r
+			indexes = append(indexes, i)
+		}
+	}
+
+	return ranges, indexes
+}
+
+// IsRangeOperation returns a boolean signifying if a query Operator is a range
+// operation or not.
+func IsRangeOperation(op query.Operator) bool {
+	switch op {
+	case query.OpGreater, query.OpGreaterEqual, query.OpLess, query.OpLessEqual:
+		return true
+
+	default:
+		return false
+	}
+}
diff --git a/state/txindex/indexer.go b/state/txindex/indexer.go
index 738f41d40..621ab6e4e 100644
--- a/state/txindex/indexer.go
+++ b/state/txindex/indexer.go
@@ -8,9 +8,10 @@ import (
 	"github.com/line/ostracon/libs/pubsub/query"
 )
 
+// XXX/TODO: These types should be moved to the indexer package.
+
 // TxIndexer interface defines methods to index and search transactions.
 type TxIndexer interface {
-
 	// AddBatch analyzes, indexes and stores a batch of transactions.
 	AddBatch(b *Batch) error
 
@@ -25,9 +26,6 @@ type TxIndexer interface {
 	Search(ctx context.Context, q *query.Query) ([]*abci.TxResult, error)
 }
 
-//----------------------------------------------------
-// Txs are written as a batch
-
 // Batch groups together multiple Index operations to be performed at the same time.
 // NOTE: Batch is NOT thread-safe and must not be modified after starting its execution.
 type Batch struct {
@@ -52,8 +50,5 @@ func (b *Batch) Size() int {
 	return len(b.Ops)
 }
 
-//----------------------------------------------------
-// Errors
-
 // ErrorEmptyHash indicates empty hash
 var ErrorEmptyHash = errors.New("transaction hash cannot be empty")
diff --git a/state/txindex/indexer_service.go b/state/txindex/indexer_service.go
index 3886c4140..4d746b9e7 100644
--- a/state/txindex/indexer_service.go
+++ b/state/txindex/indexer_service.go
@@ -4,26 +4,34 @@ import (
 	"context"
 
 	"github.com/line/ostracon/libs/service"
-
+	"github.com/line/ostracon/state/indexer"
 	"github.com/line/ostracon/types"
 )
 
+// XXX/TODO: These types should be moved to the indexer package.
+
 const (
 	subscriber = "IndexerService"
 )
 
-// IndexerService connects event bus and transaction indexer together in order
-// to index transactions coming from event bus.
+// IndexerService connects event bus, transaction and block indexers together in
+// order to index transactions and blocks coming from the event bus.
 type IndexerService struct {
 	service.BaseService
 
-	idr      TxIndexer
-	eventBus *types.EventBus
+	txIdxr    TxIndexer
+	blockIdxr indexer.BlockIndexer
+	eventBus  *types.EventBus
 }
 
 // NewIndexerService returns a new service instance.
-func NewIndexerService(idr TxIndexer, eventBus *types.EventBus) *IndexerService {
-	is := &IndexerService{idr: idr, eventBus: eventBus}
+func NewIndexerService(
+	txIdxr TxIndexer,
+	blockIdxr indexer.BlockIndexer,
+	eventBus *types.EventBus,
+) *IndexerService {
+
+	is := &IndexerService{txIdxr: txIdxr, blockIdxr: blockIdxr, eventBus: eventBus}
 	is.BaseService = *service.NewBaseService(nil, "IndexerService", is)
 	return is
 }
@@ -34,7 +42,6 @@ func (is *IndexerService) OnStart() error {
 	// Use SubscribeUnbuffered here to ensure both subscriptions does not get
 	// cancelled due to not pulling messages fast enough. Cause this might
 	// sometimes happen when there are no other subscribers.
-
 	blockHeadersSub, err := is.eventBus.SubscribeUnbuffered(
 		context.Background(),
 		subscriber,
@@ -54,20 +61,31 @@ func (is *IndexerService) OnStart() error {
 			eventDataHeader := msg.Data().(types.EventDataNewBlockHeader)
 			height := eventDataHeader.Header.Height
 			batch := NewBatch(eventDataHeader.NumTxs)
+
 			for i := int64(0); i < eventDataHeader.NumTxs; i++ {
 				msg2 := <-txsSub.Out()
 				txResult := msg2.Data().(types.EventDataTx).TxResult
+
 				if err = batch.Add(&txResult); err != nil {
-					is.Logger.Error("Can't add tx to batch",
+					is.Logger.Error(
+						"failed to add tx to batch",
 						"height", height,
 						"index", txResult.Index,
-						"err", err)
+						"err", err,
+					)
 				}
 			}
-			if err = is.idr.AddBatch(batch); err != nil {
-				is.Logger.Error("Failed to index block", "height", height, "err", err)
+
+			if err := is.blockIdxr.Index(eventDataHeader); err != nil {
+				is.Logger.Error("failed to index block", "height", height, "err", err)
+			} else {
+				is.Logger.Error("indexed block", "height", height)
+			}
+
+			if err = is.txIdxr.AddBatch(batch); err != nil {
+				is.Logger.Error("failed to index block txs", "height", height, "err", err)
 			} else {
-				is.Logger.Debug("indexed block", "height", height)
+				is.Logger.Debug("indexed block txs", "height", height, "num_txs", eventDataHeader.NumTxs)
 			}
 		}
 	}()
diff --git a/state/txindex/indexer_service_test.go b/state/txindex/indexer_service_test.go
index 941768625..7ee97c012 100644
--- a/state/txindex/indexer_service_test.go
+++ b/state/txindex/indexer_service_test.go
@@ -5,11 +5,12 @@ import (
 	"time"
 
 	"github.com/line/tm-db/v2/memdb"
-	"github.com/stretchr/testify/assert"
+	"github.com/line/tm-db/v2/prefixdb"
 	"github.com/stretchr/testify/require"
 
 	abci "github.com/line/ostracon/abci/types"
 	"github.com/line/ostracon/libs/log"
+	blockidxkv "github.com/line/ostracon/state/indexer/block/kv"
 	"github.com/line/ostracon/state/txindex"
 	"github.com/line/ostracon/state/txindex/kv"
 	"github.com/line/ostracon/types"
@@ -30,8 +31,9 @@ func TestIndexerServiceIndexesBlocks(t *testing.T) {
 	// tx indexer
 	store := memdb.NewDB()
 	txIndexer := kv.NewTxIndex(store)
+	blockIndexer := blockidxkv.New(prefixdb.NewDB(store, []byte("block_events")))
 
-	service := txindex.NewIndexerService(txIndexer, eventBus)
+	service := txindex.NewIndexerService(txIndexer, blockIndexer, eventBus)
 	service.SetLogger(log.TestingLogger())
 	err = service.Start()
 	require.NoError(t, err)
@@ -66,11 +68,15 @@ func TestIndexerServiceIndexesBlocks(t *testing.T) {
 
 	time.Sleep(100 * time.Millisecond)
 
-	// check the result
 	res, err := txIndexer.Get(types.Tx("foo").Hash())
-	assert.NoError(t, err)
-	assert.Equal(t, txResult1, res)
+	require.NoError(t, err)
+	require.Equal(t, txResult1, res)
+
+	ok, err := blockIndexer.Has(1)
+	require.NoError(t, err)
+	require.True(t, ok)
+
 	res, err = txIndexer.Get(types.Tx("bar").Hash())
-	assert.NoError(t, err)
-	assert.Equal(t, txResult2, res)
+	require.NoError(t, err)
+	require.Equal(t, txResult2, res)
 }
diff --git a/state/txindex/kv/kv.go b/state/txindex/kv/kv.go
index b15511e5b..46b3cf847 100644
--- a/state/txindex/kv/kv.go
+++ b/state/txindex/kv/kv.go
@@ -7,13 +7,13 @@ import (
 	"fmt"
 	"strconv"
 	"strings"
-	"time"
 
 	"github.com/gogo/protobuf/proto"
 	dbm "github.com/line/tm-db/v2"
 
 	abci "github.com/line/ostracon/abci/types"
 	"github.com/line/ostracon/libs/pubsub/query"
+	"github.com/line/ostracon/state/indexer"
 	"github.com/line/ostracon/state/txindex"
 	"github.com/line/ostracon/types"
 )
@@ -170,11 +170,10 @@ func (txi *TxIndex) indexEvents(result *abci.TxResult, hash []byte, store dbm.Ba
 // Search will exit early and return any result fetched so far,
 // when a message is received on the context chan.
 func (txi *TxIndex) Search(ctx context.Context, q *query.Query) ([]*abci.TxResult, error) {
-	// Potentially exit early.
 	select {
 	case <-ctx.Done():
-		results := make([]*abci.TxResult, 0)
-		return results, nil
+		return make([]*abci.TxResult, 0), nil
+
 	default:
 	}
 
@@ -209,13 +208,13 @@ func (txi *TxIndex) Search(ctx context.Context, q *query.Query) ([]*abci.TxResul
 	// extract ranges
 	// if both upper and lower bounds exist, it's better to get them in order not
 	// no iterate over kvs that are not within range.
-	ranges, rangeIndexes := lookForRanges(conditions)
+	ranges, rangeIndexes := indexer.LookForRanges(conditions)
 	if len(ranges) > 0 {
 		skipIndexes = append(skipIndexes, rangeIndexes...)
 
-		for _, r := range ranges {
+		for _, qr := range ranges {
 			if !hashesInitialized {
-				filteredHashes = txi.matchRange(ctx, r, startKey(r.key), filteredHashes, true)
+				filteredHashes = txi.matchRange(ctx, qr, startKey(qr.Key), filteredHashes, true)
 				hashesInitialized = true
 
 				// Ignore any remaining conditions if the first condition resulted
@@ -224,7 +223,7 @@ func (txi *TxIndex) Search(ctx context.Context, q *query.Query) ([]*abci.TxResul
 					break
 				}
 			} else {
-				filteredHashes = txi.matchRange(ctx, r, startKey(r.key), filteredHashes, false)
+				filteredHashes = txi.matchRange(ctx, qr, startKey(qr.Key), filteredHashes, false)
 			}
 		}
 	}
@@ -291,100 +290,6 @@ func lookForHeight(conditions []query.Condition) (height int64) {
 	return 0
 }
 
-// special map to hold range conditions
-// Example: account.number => queryRange{lowerBound: 1, upperBound: 5}
-type queryRanges map[string]queryRange
-
-type queryRange struct {
-	lowerBound        interface{} // int || time.Time
-	upperBound        interface{} // int || time.Time
-	key               string
-	includeLowerBound bool
-	includeUpperBound bool
-}
-
-func (r queryRange) lowerBoundValue() interface{} {
-	if r.lowerBound == nil {
-		return nil
-	}
-
-	if r.includeLowerBound {
-		return r.lowerBound
-	}
-
-	switch t := r.lowerBound.(type) {
-	case int64:
-		return t + 1
-	case time.Time:
-		return t.Unix() + 1
-	default:
-		panic("not implemented")
-	}
-}
-
-func (r queryRange) AnyBound() interface{} {
-	if r.lowerBound != nil {
-		return r.lowerBound
-	}
-
-	return r.upperBound
-}
-
-func (r queryRange) upperBoundValue() interface{} {
-	if r.upperBound == nil {
-		return nil
-	}
-
-	if r.includeUpperBound {
-		return r.upperBound
-	}
-
-	switch t := r.upperBound.(type) {
-	case int64:
-		return t - 1
-	case time.Time:
-		return t.Unix() - 1
-	default:
-		panic("not implemented")
-	}
-}
-
-func lookForRanges(conditions []query.Condition) (ranges queryRanges, indexes []int) {
-	ranges = make(queryRanges)
-	for i, c := range conditions {
-		if isRangeOperation(c.Op) {
-			r, ok := ranges[c.CompositeKey]
-			if !ok {
-				r = queryRange{key: c.CompositeKey}
-			}
-			switch c.Op {
-			case query.OpGreater:
-				r.lowerBound = c.Operand
-			case query.OpGreaterEqual:
-				r.includeLowerBound = true
-				r.lowerBound = c.Operand
-			case query.OpLess:
-				r.upperBound = c.Operand
-			case query.OpLessEqual:
-				r.includeUpperBound = true
-				r.upperBound = c.Operand
-			}
-			ranges[c.CompositeKey] = r
-			indexes = append(indexes, i)
-		}
-	}
-	return ranges, indexes
-}
-
-func isRangeOperation(op query.Operator) bool {
-	switch op {
-	case query.OpGreater, query.OpGreaterEqual, query.OpLess, query.OpLessEqual:
-		return true
-	default:
-		return false
-	}
-}
-
 // match returns all matching txs by hash that meet a given condition and start
 // key. An already filtered result (filteredHashes) is provided such that any
 // non-intersecting matches are removed.
@@ -519,7 +424,7 @@ func (txi *TxIndex) match(
 // NOTE: filteredHashes may be empty if no previous condition has matched.
 func (txi *TxIndex) matchRange(
 	ctx context.Context,
-	r queryRange,
+	qr indexer.QueryRange,
 	startKey []byte,
 	filteredHashes map[string][]byte,
 	firstRun bool,
@@ -531,8 +436,8 @@ func (txi *TxIndex) matchRange(
 	}
 
 	tmpHashes := make(map[string][]byte)
-	lowerBound := r.lowerBoundValue()
-	upperBound := r.upperBoundValue()
+	lowerBound := qr.LowerBoundValue()
+	upperBound := qr.UpperBoundValue()
 
 	it, err := txi.store.PrefixIterator(startKey)
 	if err != nil {
@@ -546,7 +451,7 @@ LOOP:
 			continue
 		}
 
-		if _, ok := r.AnyBound().(int64); ok {
+		if _, ok := qr.AnyBound().(int64); ok {
 			v, err := strconv.ParseInt(extractValueFromKey(it.Key()), 10, 64)
 			if err != nil {
 				continue LOOP
diff --git a/test/e2e/app/app.go b/test/e2e/app/app.go
index 43dea19d1..b044a8bf1 100644
--- a/test/e2e/app/app.go
+++ b/test/e2e/app/app.go
@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strconv"
 
 	cryptoenc "github.com/line/ostracon/crypto/encoding"
 	"github.com/line/ostracon/proto/ostracon/crypto"
@@ -101,12 +102,29 @@ func (app *Application) DeliverTx(req abci.RequestDeliverTx) abci.ResponseDelive
 
 // EndBlock implements ABCI.
 func (app *Application) EndBlock(req abci.RequestEndBlock) abci.ResponseEndBlock {
-	var err error
-	resp := abci.ResponseEndBlock{}
-	if resp.ValidatorUpdates, err = app.validatorUpdates(uint64(req.Height)); err != nil {
+	valUpdates, err := app.validatorUpdates(uint64(req.Height))
+	if err != nil {
 		panic(err)
 	}
-	return resp
+
+	return abci.ResponseEndBlock{
+		ValidatorUpdates: valUpdates,
+		Events: []abci.Event{
+			{
+				Type: "val_updates",
+				Attributes: []abci.EventAttribute{
+					{
+						Key:   []byte("size"),
+						Value: []byte(strconv.Itoa(valUpdates.Len())),
+					},
+					{
+						Key:   []byte("height"),
+						Value: []byte(strconv.Itoa(int(req.Height))),
+					},
+				},
+			},
+		},
+	}
 }
 
 // Commit implements ABCI.
diff --git a/test/maverick/node/node.go b/test/maverick/node/node.go
index 066cbd6c5..8c26bc37c 100644
--- a/test/maverick/node/node.go
+++ b/test/maverick/node/node.go
@@ -18,6 +18,7 @@ import (
 	"github.com/rs/cors"
 
 	dbm "github.com/line/tm-db/v2"
+	pdbm "github.com/line/tm-db/v2/prefixdb"
 
 	abci "github.com/line/ostracon/abci/types"
 	bcv0 "github.com/line/ostracon/blockchain/v0"
@@ -41,6 +42,9 @@ import (
 	grpccore "github.com/line/ostracon/rpc/grpc"
 	rpcserver "github.com/line/ostracon/rpc/jsonrpc/server"
 	sm "github.com/line/ostracon/state"
+	"github.com/line/ostracon/state/indexer"
+	blockidxkv "github.com/line/ostracon/state/indexer/block/kv"
+	blockidxnull "github.com/line/ostracon/state/indexer/block/null"
 	"github.com/line/ostracon/state/txindex"
 	"github.com/line/ostracon/state/txindex/kv"
 	"github.com/line/ostracon/state/txindex/null"
@@ -167,7 +171,7 @@ func DefaultMetricsProvider(config *cfg.InstrumentationConfig) MetricsProvider {
 type Option func(*Node)
 
 // Temporary interface for switching to fast sync, we should get rid of v0 and v1 reactors.
-// See: https://github.com/tendermint/tendermint/issues/4595
+// See: https://github.com/line/ostracon/issues/4595
 type fastSyncReactor interface {
 	SwitchToFastSync(sm.State) error
 }
@@ -257,6 +261,7 @@ type Node struct {
 	proxyApp          proxy.AppConns          // connection to the application
 	rpcListeners      []net.Listener          // rpc servers
 	txIndexer         txindex.TxIndexer
+	blockIndexer      indexer.BlockIndexer
 	indexerService    *txindex.IndexerService
 	prometheusSrv     *http.Server
 }
@@ -295,27 +300,40 @@ func createAndStartEventBus(logger log.Logger) (*types.EventBus, error) {
 	return eventBus, nil
 }
 
-func createAndStartIndexerService(config *cfg.Config, dbProvider DBProvider,
-	eventBus *types.EventBus, logger log.Logger) (*txindex.IndexerService, txindex.TxIndexer, error) {
+func createAndStartIndexerService(
+	config *cfg.Config,
+	dbProvider DBProvider,
+	eventBus *types.EventBus,
+	logger log.Logger,
+) (*txindex.IndexerService, txindex.TxIndexer, indexer.BlockIndexer, error) {
+
+	var (
+		txIndexer    txindex.TxIndexer
+		blockIndexer indexer.BlockIndexer
+	)
 
-	var txIndexer txindex.TxIndexer
 	switch config.TxIndex.Indexer {
 	case "kv":
 		store, err := dbProvider(&DBContext{"tx_index", config})
 		if err != nil {
-			return nil, nil, err
+			return nil, nil, nil, err
 		}
+
 		txIndexer = kv.NewTxIndex(store)
+		blockIndexer = blockidxkv.New(pdbm.NewDB(store, []byte("block_events")))
 	default:
 		txIndexer = &null.TxIndex{}
+		blockIndexer = &blockidxnull.BlockerIndexer{}
 	}
 
-	indexerService := txindex.NewIndexerService(txIndexer, eventBus)
+	indexerService := txindex.NewIndexerService(txIndexer, blockIndexer, eventBus)
 	indexerService.SetLogger(logger.With("module", "txindex"))
+
 	if err := indexerService.Start(); err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
-	return indexerService, txIndexer, nil
+
+	return indexerService, txIndexer, blockIndexer, nil
 }
 
 func doHandshake(
@@ -624,7 +642,7 @@ func createPEXReactorAndAddToSwitch(addrBook pex.AddrBook, config *cfg.Config,
 			// blocks assuming 10s blocks ~ 28 hours.
 			// TODO (melekes): make it dynamic based on the actual block latencies
 			// from the live network.
-			// https://github.com/tendermint/tendermint/issues/3523
+			// https://github.com/line/ostracon/issues/3523
 			SeedDisconnectWaitPeriod:     28 * time.Hour,
 			PersistentPeersMaxDialPeriod: config.P2P.PersistentPeersMaxDialPeriod,
 			RecvBufSize:                  config.P2P.PexRecvBufSize,
@@ -736,8 +754,7 @@ func NewNode(config *cfg.Config,
 		return nil, err
 	}
 
-	// Transaction indexing
-	indexerService, txIndexer, err := createAndStartIndexerService(config, dbProvider, eventBus, logger)
+	indexerService, txIndexer, blockIndexer, err := createAndStartIndexerService(config, dbProvider, eventBus, logger)
 	if err != nil {
 		return nil, err
 	}
@@ -828,7 +845,7 @@ func NewNode(config *cfg.Config,
 	// Set up state sync reactor, and schedule a sync if requested.
 	// FIXME The way we do phased startups (e.g. replay -> fast sync -> consensus) is very messy,
 	// we should clean this whole thing up. See:
-	// https://github.com/tendermint/tendermint/issues/4644
+	// https://github.com/line/ostracon/issues/4644
 	stateSyncReactor := statesync.NewReactor(proxyApp.Snapshot(), proxyApp.Query(),
 		config.P2P.RecvAsync, config.P2P.StatesyncRecvBufSize)
 	stateSyncReactor.SetLogger(logger.With("module", "statesync"))
@@ -913,6 +930,7 @@ func NewNode(config *cfg.Config,
 		proxyApp:         proxyApp,
 		txIndexer:        txIndexer,
 		indexerService:   indexerService,
+		blockIndexer:     blockIndexer,
 		eventBus:         eventBus,
 	}
 	node.BaseService = *service.NewBaseService(logger, "Node", node)
@@ -1069,6 +1087,7 @@ func (n *Node) ConfigureRPC() error {
 		PubKey:           pubKey,
 		GenDoc:           n.genesisDoc,
 		TxIndexer:        n.txIndexer,
+		BlockIndexer:     n.blockIndexer,
 		ConsensusReactor: &consensus.Reactor{},
 		EventBus:         n.eventBus,
 		Mempool:          n.mempool,
@@ -1098,7 +1117,7 @@ func (n *Node) startRPC() ([]net.Listener, error) {
 	config.MaxOpenConnections = n.config.RPC.MaxOpenConnections
 	// If necessary adjust global WriteTimeout to ensure it's greater than
 	// TimeoutBroadcastTxCommit.
-	// See https://github.com/tendermint/tendermint/issues/3435
+	// See https://github.com/line/ostracon/issues/3435
 	if config.WriteTimeout <= n.config.RPC.TimeoutBroadcastTxCommit {
 		config.WriteTimeout = n.config.RPC.TimeoutBroadcastTxCommit + 1*time.Second
 	}
@@ -1177,7 +1196,7 @@ func (n *Node) startRPC() ([]net.Listener, error) {
 		config.MaxOpenConnections = n.config.RPC.GRPCMaxOpenConnections
 		// If necessary adjust global WriteTimeout to ensure it's greater than
 		// TimeoutBroadcastTxCommit.
-		// See https://github.com/tendermint/tendermint/issues/3435
+		// See https://github.com/line/ostracon/issues/3435
 		if config.WriteTimeout <= n.config.RPC.TimeoutBroadcastTxCommit {
 			config.WriteTimeout = n.config.RPC.TimeoutBroadcastTxCommit + 1*time.Second
 		}
diff --git a/types/events.go b/types/events.go
index db5b809e1..770b06bab 100644
--- a/types/events.go
+++ b/types/events.go
@@ -136,6 +136,10 @@ const (
 	// TxHeightKey is a reserved key, used to specify transaction block's height.
 	// see EventBus#PublishEventTx
 	TxHeightKey = "tx.height"
+
+	// BlockHeightKey is a reserved key used for indexing BeginBlock and Endblock
+	// events.
+	BlockHeightKey = "block.height"
 )
 
 var (