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lighthouse/book/src/http_validator.md
Age Manning b1d23ec294 Adds valid block response to http book example (#910)
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Lighthouse REST API: /validator

The /validator endpoints provide the minimum functionality required for a validator client to connect to the beacon node and produce blocks and attestations.

Endpoints

HTTP Path Description
/validator/duties Provides block and attestation production information for validators.
/validator/duties/all Provides block and attestation production information for all validators.
/validator/duties/active Provides block and attestation production information for all active validators.
/validator/block Produces a BeaconBlock object from current state.
/validator/attestation Produces an unsigned Attestation object from current state.
/validator/block Processes a SignedBeaconBlock object and publishes it to the network.
/validator/attestation Processes a signed Attestation and publishes it to the network.

/validator/duties

Request information about when a validator must produce blocks and attestations at some given epoch. The information returned always refers to the canonical chain and the same input parameters may yield different results after a re-org.

HTTP Specification

Property Specification
Path /validator/duties
Method POST
JSON Encoding Object
Query Parameters None
Typical Responses 200

Request Body

Expects the following object in the POST request body:

{
	epoch: Epoch,
	pubkeys: [PublicKey]
}

Duties are assigned on a per-epoch basis, all duties returned will contain slots that are inside the given epoch. A set of duties will be returned for each of the pubkeys.

Validators who are not known to the beacon chain (e.g., have not yet deposited) will have null values for most fields.

Returns

A set of duties for each given pubkey.

Example

Request Body

{
    "epoch": 1203,
    "pubkeys": [
        "0x98f87bc7c8fa10408425bbeeeb3dc387e3e0b4bd92f57775b60b39156a16f9ec80b273a64269332d97bdb7d93ae05a16",
        "0x42f87bc7c8fa10408425bbeeeb3dc3874242b4bd92f57775b60b39142426f9ec80b273a64269332d97bdb7d93ae05a42"
    ]
}

Note: for demonstration purposes the second pubkey is some unknown pubkey.

Response Body

[
    {
        "validator_pubkey": "0x98f87bc7c8fa10408425bbeeeb3dc387e3e0b4bd92f57775b60b39156a16f9ec80b273a64269332d97bdb7d93ae05a16",
        "validator_index": 14935,
        "attestation_slot": 38511,
        "attestation_committee_index": 3,
        "attestation_committee_position": 39,
        "block_proposal_slots": []
    },
    {
        "validator_pubkey": "0x42f87bc7c8fa10408425bbeeeb3dc3874242b4bd92f57775b60b39142426f9ec80b273a64269332d97bdb7d93ae05a42",
        "validator_index": null,
        "attestation_slot": null,
        "attestation_committee_index": null,
        "attestation_committee_position": null,
        "block_proposal_slots": []
    }
]

/validator/duties/all

Returns the duties for all validators, equivalent to calling Validator Duties while providing all known validator public keys.

Considering that duties for non-active validators will just be null, it is generally more efficient to query using Active Validator Duties.

This endpoint will only return validators that were in the beacon state in the given epoch. For example, if the query epoch is 10 and some validator deposit was included in epoch 11, that validator will not be included in the result.

HTTP Specification

Property Specification
Path /validator/duties/all
Method GET
JSON Encoding Object
Query Parameters epoch
Typical Responses 200

Parameters

The duties returned will all be inside the given epoch (Epoch) query parameter. This parameter is required.

Returns

The return format is identical to the Validator Duties response body.

/validator/duties/active

Returns the duties for all active validators, equivalent to calling Validator Duties while providing all known validator public keys that are active in the given epoch.

This endpoint will only return validators that were in the beacon state in the given epoch. For example, if the query epoch is 10 and some validator deposit was included in epoch 11, that validator will not be included in the result.

HTTP Specification

Property Specification
Path /validator/duties/active
Method GET
JSON Encoding Object
Query Parameters epoch
Typical Responses 200

Parameters

The duties returned will all be inside the given epoch (Epoch) query parameter. This parameter is required.

Returns

The return format is identical to the Validator Duties response body.

/validator/block

Produces and returns an unsigned BeaconBlock object.

The block will be produced with the given slot and the parent block will be the highest block in the canonical chain that has a slot less than slot. The block will still be produced if some other block is also known to be at slot (i.e., it may produce a block that would be slashable if signed).

HTTP Specification

Property Specification
Path /validator/block
Method GET
JSON Encoding Object
Query Parameters slot, randao_reveal
Typical Responses 200

Parameters

  • slot (Slot): The slot number for which the block is to be produced.
  • randao_reveal (Signature): 96 bytes Signature for the randomness.

Returns

Returns a BeaconBlock object.

Response Body

{
    "slot": 33,
    "parent_root": "0xf54de54bd33e33aee4706cffff4bd991bcbf522f2551ab007180479c63f4fe912",
    "state_root": "0x615c887bad27bc05754d627d941e1730e1b4c77b2eb4378c195ac8a8203bbf26",
    "body": {
      "randao_reveal": "0x8d7b2a32b026e9c79aae6ec6b83eabae89d60cacd65ac41ed7d2f4be9dd8c89c1bf7cd3d700374e18d03d12f6a054c23006f64f0e4e8b7cf37d6ac9a4c7d815c858120c54673b7d3cb2bb1550a4d659eaf46e34515677c678b70d6f62dbf89f",
      "eth1_data": {
        "deposit_root": "0x66687aadf862bd776c8fc18b8e9f8e20089714856ee233b3902a591d0d5f2925",
        "deposit_count": 8,
        "block_hash": "0x2b32db6c2c0a6235fb1397e8225ea85e0f0e6e8c7b126d0016ccbde0e667151e"
      },
      "graffiti": "0x736967702f6c69676874686f7573652d302e312e312d7076572656c65617365",
      "proposer_slashings": [],
      "attester_slashings": [],
      "attestations": [],
      "deposits": [],
      "voluntary_exits": []
    }
}

/validator/attestation

Produces and returns an unsigned Attestation from the current state.

The attestation will reference the beacon_block_root of the highest block in the canonical chain with a slot equal to or less than the given slot.

An error will be returned if the given slot is more than SLOTS_PER_HISTORICAL_VECTOR slots behind the current head block.

This endpoint is not protected against slashing. Signing the returned attestation may result in a slashable offence.

HTTP Specification

Property Specification
Path /validator/attestation
Method GET
JSON Encoding Object
Query Parameters slot, committee_index
Typical Responses 200

Parameters

  • slot (Slot): The slot number for which the attestation is to be produced.
  • committee_index (CommitteeIndex): The index of the committee that makes the attestation.

Returns

Returns a Attestation object with a default signature. The signature field should be replaced by the valid signature.

Response Body

{
    "aggregation_bits": "0x01",
    "data": {
        "slot": 100,
        "index": 0,
        "beacon_block_root": "0xf22e4ec281136d119eabcd4d9d248aeacd042eb63d8d7642f73ad3e71f1c9283",
        "source": {
            "epoch": 2,
            "root": "0x34c1244535c923f08e7f83170d41a076e4f1ec61013846b3a615a1d109d3c329"
        },
        "target": {
            "epoch": 3,
            "root": "0xaefd23b384994dc0c1a6b77836bdb2f24f209ebfe6c4819324d9685f4a43b4e1"
        }
    },
    "signature": "0xc00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
}

/validator/block

Accepts a SignedBeaconBlock for verification. If it is valid, it will be imported into the local database and published on the network. Invalid blocks will not be published to the network.

A block may be considered invalid because it is fundamentally incorrect, or its parent has not yet been imported.

HTTP Specification

Property Specification
Path /validator/block
Method POST
JSON Encoding Object
Query Parameters None
Typical Responses 200/202

Request Body

Expects a JSON encoded SignedBeaconBlock in the POST request body:

Returns

Returns a null object if the block passed all block validation and is published to the network. Else, returns a processing error description.

Example

Request Body

{
  "message": {
    "slot": 33,
    "parent_root": "0xf54de54bd33e33aee4706cffff4bd991bcbf522f2551ab007180479c63f4fe912",
    "state_root": "0x615c887bad27bc05754d627d941e1730e1b4c77b2eb4378c195ac8a8203bbf26",
    "body": {
      "randao_reveal": "0x8d7b2a32b026e9c79aae6ec6b83eabae89d60cacd65ac41ed7d2f4be9dd8c89c1bf7cd3d700374e18d03d12f6a054c23006f64f0e4e8b7cf37d6ac9a4c7d815c858120c54673b7d3cb2bb1550a4d659eaf46e34515677c678b70d6f62dbf89f",
      "eth1_data": {
        "deposit_root": "0x66687aadf862bd776c8fc18b8e9f8e20089714856ee233b3902a591d0d5f2925",
        "deposit_count": 8,
        "block_hash": "0x2b32db6c2c0a6235fb1397e8225ea85e0f0e6e8c7b126d0016ccbde0e667151e"
      },
      "graffiti": "0x736967702f6c69676874686f7573652d302e312e312d7076572656c65617365",
      "proposer_slashings": [

      ],
      "attester_slashings": [

      ],
      "attestations": [

      ],
      "deposits": [

      ],
      "voluntary_exits": [

      ]
    }
  },
  "signature": "0x965ced900dbabd0a78b81a0abb5d03407be0d38762104316416347f2ea6f82652b5759396f402e85df8ee18ba2c60145037c73b1c335f4272f1751a1cd89862b7b4937c035e350d0108554bd4a8930437ec3311c801a65fe8e5ba022689b5c24"
}

/validator/attestation

Accepts an Attestation for verification. If it is valid, it will be imported into the local database and published to the network. Invalid attestations will not be published to the network.

An attestation may be considered invalid because it is fundamentally incorrect or because the beacon node has not imported the relevant blocks required to verify it.

HTTP Specification

Property Specification
Path /validator/attestation
Method POST
JSON Encoding Object
Query Parameters None
Typical Responses 200/202

Request Body

Expects a JSON encoded signedAttestation object in the POST request body:

Returns

Returns a null object if the attestation passed all validation and is published to the network. Else, returns a processing error description.

Example

Request Body

{
  "aggregation_bits": "0x03",
  "data": {
    "slot": 3,
    "index": 0,
    "beacon_block_root": "0x0b6a1f7a9baa38d00ef079ba861b7587662565ca2502fb9901741c1feb8bb3c9",
    "source": {
      "epoch": 0,
      "root": "0x0000000000000000000000000000000000000000000000000000000000000000"
    },
    "target": {
      "epoch": 0,
      "root": "0xad2c360ab8c8523db278a7d7ced22f3810800f2fdc282defb6db216689d376bd"
    }
  },
  "signature": "0xb76a1768c18615b5ade91a92e7d2ed0294f7e088e56e30fbe7e3aa6799c443b11bccadd578ca2cbd95d395ab689b9e4d03c88a56641791ab38dfa95dc1f4d24d1b19b9d36c96c20147ad03$649bd3c6c7e8a39cf2ffb99e07b4964d52854559f"
}
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