Update slashing protection information.

docs/Concepts/Slashing-Protection.md

@@ -31,13 +31,14 @@ Teku provides command line options to [import] or [export] the slash protection
 
 ## Validator slash protection file
 
-The slash protection file records three values that protects the validator from incorrectly
+The slash protection file records multiple values that protects the validator from incorrectly
 signing blocks or attestations.
 
 !!! example
 
     ```bash
     ---
+    genesisValidatorsRoot: "0x9436e8a630e3162b7ed4f449b12b8a5a368a4b95bc46b941ae65c11613bfa4c1"
     lastSignedBlockSlot: 71090
     lastSignedAttestationSourceEpoch: 2290
     lastSignedAttestationTargetEpoch: 3247
@@ -49,6 +50,15 @@ The following rules apply to the file:
 * A validator will not sign an attestation unless the attestation source is less than or equal to
     `lastSignedAttestationSourceEpoch`, and the attestation target epoch is greater than
     `lastSignedAttestationTargetEpoch`.
+* `genesisValidatorsRoot` is a hash of the validators active at genesis, and is used to
+    differentiate between different chains. Teku does not require this field to be present, but if
+    it is present and differs from the required value, then Teku returns an error.
+
+!!! info
+
+    You can obtain the `genesisValidatorsRoot` value by using the
+    [`/eth/v1/beacon/genesis`](https://consensys.github.io/teku/#operation/getEthV1BeaconGenesis)
+    API.
 
 These rules guarantee the validator does not sign anything that is slashable.
 

docs/HowTo/Prevent-Slashing.md

@@ -8,7 +8,8 @@ title: Import or export a slashing protection file
 blocks or attestations.
 
 You can import and export the slashing-protection file when migrating validator keys between
-validator clients.
+validator clients. Teku supports the [validator client interchange format] when importing or
+exporting the slashing-protection file.
 
 !!! note
 
@@ -23,8 +24,6 @@ When importing the slashing-protection file, Teku imports the file to the
 `<data-path>/validators/slashprotection/` directory in the format `<validator-pubkey>.yml`
 (with no 0x prefix).
 
-Teku supports files using the [Minimal] or [Complete] interchange format when importing.
-
 !!! example
 
     ```
@@ -43,7 +42,7 @@ In this example, Teku imports the file to the `/home/me/me_node/data/validators/
 ## Exporting a slashing-protection file
 
 Export the slashing-protection file when migrating a validator to a different Teku, or non-Teku
-node. Teku exports the slashing protection file in the [Minimal] format.
+node.
 
 !!! example
 
@@ -63,6 +62,5 @@ You can now import the slashing-protection file in a Teku, or non-Teku node.
 <!--links -->
 [Teku implements slashing protection]: ../Concepts/Slashing-Protection.md
 [data path directory when starting Teku]: ../Reference/CLI/CLI-Syntax.md#data-path
-[Minimal]: https://hackmd.io/@sproul/Bk0Y0qdGD#Format-2-Minimal
-[Complete]: https://hackmd.io/@sproul/Bk0Y0qdGD#Format-1-Complete
+[validator client interchange format]: https://eips.ethereum.org/EIPS/eip-3076
 [Web3Signer]: https://docs.web3signer.consensys.net/en/latest/

docs/Reference/CLI/Subcommands/Slashing-Protection.md

@@ -15,7 +15,7 @@ You can also supply the subcommand options using [environment variables or a con
 
 ## `import`
 
-Imports the slashing protection database. Supports the [Minimal] or [Complete] interchange format.
+Imports the slashing protection database using the [validator client interchange format].
 
 ### config-file
 
@@ -83,7 +83,7 @@ Teku imports the file to the `<data-path>/validators/slashprotection/` directory
 
 ## `export`
 
-Exports the slashing protection database in [Minimal] format.
+Exports the slashing protection database in the [validator client interchange format] format.
 
 ### config-file
 
@@ -144,10 +144,9 @@ The path to the Teku data directory. The default directory is OS dependent:
 
 The file to export the slashing protection database to.
 
-Exports the database in the [Minimal] format.
+Exports the database in the [validator client interchange format] format.
 
 <!-- links -->
 [slashing protection data]: ../../../Concepts/Slashing-Protection.md
-[Minimal]: https://hackmd.io/@sproul/Bk0Y0qdGD#Format-2-Minimal
-[Complete]: https://hackmd.io/@sproul/Bk0Y0qdGD#Format-1-Complete
+[validator client interchange format]: https://eips.ethereum.org/EIPS/eip-3076
 [environment variables or a configuration file]: ../CLI-Syntax.md#specifying-options