diff --git a/.changelog/unreleased/state-breaking/2866-migrate-signing-infos.md b/.changelog/unreleased/state-breaking/2866-migrate-signing-infos.md
new file mode 100644
index 00000000000..58ac9f43e99
--- /dev/null
+++ b/.changelog/unreleased/state-breaking/2866-migrate-signing-infos.md
@@ -0,0 +1,5 @@
+Migrate the signing infos of validators for which the consensus address is missing. 
+([\#2866](https://github.com/cosmos/gaia/pull/2866))
+
+
+
diff --git a/app/upgrades/v15/upgrades.go b/app/upgrades/v15/upgrades.go
index b14797dfeda..f43437dcd85 100644
--- a/app/upgrades/v15/upgrades.go
+++ b/app/upgrades/v15/upgrades.go
@@ -3,12 +3,18 @@ package v15
 import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	"github.com/cosmos/cosmos-sdk/types/module"
+	slashingkeeper "github.com/cosmos/cosmos-sdk/x/slashing/keeper"
+	slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
 	stakingkeeper "github.com/cosmos/cosmos-sdk/x/staking/keeper"
 	upgradetypes "github.com/cosmos/cosmos-sdk/x/upgrade/types"
 
 	"github.com/cosmos/gaia/v15/app/keepers"
 )
 
+// CreateUpgradeHandler returns a upgrade handler for Gaia v15
+// which executes the following migrations:
+//   - update the slashing module SigningInfos for which the consensus address is empty,
+//     see https://github.com/cosmos/gaia/issues/1734.
 func CreateUpgradeHandler(
 	mm *module.Manager,
 	configurator module.Configurator,
@@ -22,6 +28,7 @@ func CreateUpgradeHandler(
 			return vm, err
 		}
 
+		UpgradeSigningInfos(ctx, keepers.SlashingKeeper)
 		UpgradeMinCommissionRate(ctx, *keepers.StakingKeeper)
 
 		ctx.Logger().Info("Upgrade v15 complete")
@@ -29,6 +36,36 @@ func CreateUpgradeHandler(
 	}
 }
 
+// UpgradeSigningInfos updates the signing infos of validators for which
+// the consensus address is missing
+func UpgradeSigningInfos(ctx sdk.Context, sk slashingkeeper.Keeper) {
+	ctx.Logger().Info("Migrating signing infos...")
+
+	signingInfos := []slashingtypes.ValidatorSigningInfo{}
+
+	// update consensus address in signing info
+	// using the store key of validators
+	sk.IterateValidatorSigningInfos(ctx, func(address sdk.ConsAddress, info slashingtypes.ValidatorSigningInfo) (stop bool) {
+		if info.Address == "" {
+			info.Address = address.String()
+			signingInfos = append(signingInfos, info)
+		}
+
+		return false
+	})
+
+	for _, si := range signingInfos {
+		addr, err := sdk.ConsAddressFromBech32(si.Address)
+		if err != nil {
+			ctx.Logger().Error("incorrect consensus address in signing info %s: %s", si.Address, err)
+			continue
+		}
+		sk.SetValidatorSigningInfo(ctx, addr, si)
+	}
+
+	ctx.Logger().Info("Finished migrating signing infos")
+}
+
 // UpgradeMinCommissionRate sets the minimum commission rate staking parameter to 5%
 // and updates the commission rate for all validators that have a commission rate less than 5%
 // adhere to prop 826 which sets the minimum commission rate to 5% for all validators
diff --git a/app/upgrades/v15/upgrades_test.go b/app/upgrades/v15/upgrades_test.go
index b381be91009..3edb20ed87e 100644
--- a/app/upgrades/v15/upgrades_test.go
+++ b/app/upgrades/v15/upgrades_test.go
@@ -2,6 +2,7 @@ package v15_test
 
 import (
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/require"
 
@@ -9,13 +10,71 @@ import (
 	tmproto "github.com/cometbft/cometbft/proto/tendermint/types"
 
 	"github.com/cosmos/cosmos-sdk/crypto/keys/ed25519"
+	"github.com/cosmos/cosmos-sdk/testutil/mock"
 	sdk "github.com/cosmos/cosmos-sdk/types"
+	slashingtypes "github.com/cosmos/cosmos-sdk/x/slashing/types"
 	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
 
 	"github.com/cosmos/gaia/v15/app/helpers"
 	v15 "github.com/cosmos/gaia/v15/app/upgrades/v15"
 )
 
+func TestUpgradeSigningInfos(t *testing.T) {
+	gaiaApp := helpers.Setup(t)
+	ctx := gaiaApp.NewUncachedContext(true, tmproto.Header{})
+	slashingKeeper := gaiaApp.SlashingKeeper
+
+	signingInfosNum := 8
+	emptyAddrSigningInfo := make(map[string]struct{})
+
+	// create some dummy signing infos, half of which with an empty address field
+	for i := 0; i < signingInfosNum; i++ {
+		pubKey, err := mock.NewPV().GetPubKey()
+		require.NoError(t, err)
+
+		consAddr := sdk.ConsAddress(pubKey.Address())
+		info := slashingtypes.NewValidatorSigningInfo(
+			consAddr,
+			0,
+			0,
+			time.Unix(0, 0),
+			false,
+			0,
+		)
+
+		if i < signingInfosNum/2 {
+			info.Address = ""
+			emptyAddrSigningInfo[consAddr.String()] = struct{}{}
+		}
+
+		slashingKeeper.SetValidatorSigningInfo(ctx, consAddr, info)
+		require.NoError(t, err)
+	}
+
+	require.Equal(t, signingInfosNum/2, len(emptyAddrSigningInfo))
+
+	// check that signing info are correctly set before migration
+	slashingKeeper.IterateValidatorSigningInfos(ctx, func(address sdk.ConsAddress, info slashingtypes.ValidatorSigningInfo) (stop bool) {
+		if _, ok := emptyAddrSigningInfo[address.String()]; ok {
+			require.Empty(t, info.Address)
+		} else {
+			require.NotEmpty(t, info.Address)
+		}
+
+		return false
+	})
+
+	// upgrade signing infos
+	v15.UpgradeSigningInfos(ctx, slashingKeeper)
+
+	// check that all signing info are updated as expected after migration
+	slashingKeeper.IterateValidatorSigningInfos(ctx, func(address sdk.ConsAddress, info slashingtypes.ValidatorSigningInfo) (stop bool) {
+		require.NotEmpty(t, info.Address)
+
+		return false
+	})
+}
+
 func TestUpgradeMinCommissionRate(t *testing.T) {
 	gaiaApp := helpers.Setup(t)
 	ctx := gaiaApp.NewUncachedContext(true, tmproto.Header{})