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Document Electra fork-digest for BeaconBlocksByRange/Root v2 #4083

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Jan 16, 2025
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Document Electra fork-digest for BeaconBlocksByRange/Root v2 #4083

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38 changes: 38 additions & 0 deletions specs/electra/p2p-interface.md
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@
- [`beacon_attestation_{subnet_id}`](#beacon_attestation_subnet_id)
- [The Req/Resp domain](#the-reqresp-domain)
- [Messages](#messages)
- [BeaconBlocksByRange v2](#beaconblocksbyrange-v2)
- [BeaconBlocksByRoot v2](#beaconblocksbyroot-v2)
- [BlobSidecarsByRoot v1](#blobsidecarsbyroot-v1)
- [BlobSidecarsByRange v1](#blobsidecarsbyrange-v1)

Expand Down Expand Up @@ -112,6 +114,42 @@ The following validations are removed:

#### Messages

##### BeaconBlocksByRange v2

**Protocol ID:** `/eth2/beacon_chain/req/beacon_blocks_by_range/2/`

The Electra fork-digest is introduced to the `context` enum to specify Electra beacon block type.

Per `context = compute_fork_digest(fork_version, genesis_validators_root)`:

[0]: # (eth2spec: skip)

| `fork_version` | Chunk SSZ type |
|--------------------------|-------------------------------|
| `GENESIS_FORK_VERSION` | `phase0.SignedBeaconBlock` |
| `ALTAIR_FORK_VERSION` | `altair.SignedBeaconBlock` |
| `BELLATRIX_FORK_VERSION` | `bellatrix.SignedBeaconBlock` |
| `CAPELLA_FORK_VERSION` | `capella.SignedBeaconBlock` |
| `DENEB_FORK_VERSION` | `deneb.SignedBeaconBlock` |
| `ELECTRA_FORK_VERSION` | `electra.SignedBeaconBlock` |

##### BeaconBlocksByRoot v2

**Protocol ID:** `/eth2/beacon_chain/req/beacon_blocks_by_root/2/`

Per `context = compute_fork_digest(fork_version, genesis_validators_root)`:

[0]: # (eth2spec: skip)

| `fork_version` | Chunk SSZ type |
|--------------------------|-------------------------------|
| `GENESIS_FORK_VERSION` | `phase0.SignedBeaconBlock` |
| `ALTAIR_FORK_VERSION` | `altair.SignedBeaconBlock` |
| `BELLATRIX_FORK_VERSION` | `bellatrix.SignedBeaconBlock` |
| `CAPELLA_FORK_VERSION` | `capella.SignedBeaconBlock` |
| `DENEB_FORK_VERSION` | `deneb.SignedBeaconBlock` |
| `ELECTRA_FORK_VERSION` | `electra.SignedBeaconBlock` |

##### BlobSidecarsByRoot v1

**Protocol ID:** `/eth2/beacon_chain/req/blob_sidecars_by_root/1/`
Expand Down