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openapi.yaml
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openapi: "3.0.0"
info:
# The protocol version is embedded in the code as constant in the
# `mithril-common/src/lib.rs` file. If you plan to update it
# here to reflect changes in the API, please also update the constant in the
# Rust file.
version: 0.1.31
title: Mithril Aggregator Server
description: |
The REST API provided by a Mithril Aggregator Node in a Mithril network.
You can play with it [here](https://mithril.network/openapi-ui/).
termsOfService: http://swagger.io/terms/
contact:
name: Mithril Team
url: https://github.com/input-output-hk/mithril
license:
name: BSD 3-Clause License
url: https://github.com/input-output-hk/mithril/blob/main/LICENSE
servers:
- url: https://aggregator.release-preprod.api.mithril.network/aggregator
- url: https://aggregator.pre-release-preview.api.mithril.network/aggregator
- url: https://aggregator.testing-preview.api.mithril.network/aggregator
- url: http://localhost:8080/aggregator
paths:
/:
get:
summary: Get public specifications about the aggregator
description: |
Returns the specifications related to the aggregator:
* Open API version
* URL of Mithril documentation
* Capabilities of the aggregator
* Cardano transactions prover capabilities
responses:
"200":
description: root found
content:
application/json:
schema:
$ref: "#/components/schemas/AggregatorFeaturesMessage"
"412":
description: API version mismatch
default:
description: root error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/epoch-settings:
get:
summary: Get current epoch settings
description: |
Returns the information related to the current epoch:
* protocol parameters for current epoch
* protocol parameters for next epoch (to setup cryptography, allowing signers to register)
* signers for current epoch
* signers for next epoch
* cardano transactions signing configuration for current epoch
* cardano transactions signing configuration for next epoch
responses:
"200":
description: epoch settings found
content:
application/json:
schema:
$ref: "#/components/schemas/EpochSettingsMessage"
"412":
description: API version mismatch
default:
description: epoch settings error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/certificate-pending:
get:
summary: Get current pending certificate information
description: |
Returns the information related to the current pending certificate:
* protocol parameters, for current and next epoch (to setup cryptography)
* beacon information (where on the chain the pending certificate should be triggered)
* entity type of the message that must be signed
* verification keys of the signers, for current and next epoch
responses:
"200":
description: pending certificate found
content:
application/json:
schema:
$ref: "#/components/schemas/CertificatePendingMessage"
"204":
description: no pending certificate available
"412":
description: API version mismatch
default:
description: pending certificate error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/certificates:
get:
summary: Get most recent certificates
description: |
Returns the list of the most recent certificates
responses:
"200":
description: certificates found
content:
application/json:
schema:
$ref: "#/components/schemas/CertificateListMessage"
"412":
description: API version mismatch
default:
description: certificates retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/certificate/{certificate_hash}:
get:
summary: Get certificate by hash
description: |
Returns the certificate identified by its hash
parameters:
- name: certificate_hash
in: path
description: Hash of the certificate to retrieve
required: true
schema:
type: string
format: bytes
example: "7905e83ab5d7bc082c1bbc3033bfd19c539078830d19080d1f241c70aa532572"
responses:
"200":
description: certificate found
content:
application/json:
schema:
$ref: "#/components/schemas/CertificateMessage"
"404":
description: certificate not found
"412":
description: API version mismatch
default:
description: pending certificate error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/snapshots:
get:
summary: Get most recent snapshots
description: |
Returns the list of the most recent snapshots
responses:
"200":
description: snapshots found
content:
application/json:
schema:
$ref: "#/components/schemas/SnapshotListMessage"
"412":
description: API version mismatch
default:
description: snapshots retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/snapshot/{digest}:
get:
summary: Get snapshot information
description: |
Returns the information of a snapshot and where to retrieve its binary content
parameters:
- name: digest
in: path
description: Digest of the snapshot to retrieve
required: true
schema:
type: string
format: bytes
example: "6367ee65d0d1272e6e70736a1ea2cae34015874517f6328364f6b73930966732"
responses:
"200":
description: snapshot found
content:
application/json:
schema:
$ref: "#/components/schemas/SnapshotMessage"
"404":
description: snapshot not found
"412":
description: API version mismatch
default:
description: snapshot retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/snapshot/{digest}/download:
get:
summary: Download the snapshot
description: |
Returns the snapshot archive binary content
parameters:
- name: digest
in: path
description: Digest of the snapshot to download
required: true
schema:
type: string
format: bytes
example: "6367ee65d0d1272e6e70736a1ea2cae34015874517f6328364f6b73930966732"
responses:
"200":
description: snapshot found
content:
application/gzip:
schema:
type: string
format: binary
"404":
description: snapshot not found
"412":
description: API version mismatch
default:
description: snapshot retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/mithril-stake-distributions:
get:
summary: Get most recent Mithril stake distributions
description: |
Returns the list of the most recent Mithril stake distributions
responses:
"200":
description: Mithril stake distribution found
content:
application/json:
schema:
$ref: "#/components/schemas/MithrilStakeDistributionListMessage"
"412":
description: API version mismatch
default:
description: Mithril stake distribution retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/mithril-stake-distribution/{hash}:
get:
summary: Get Mithril stake distribution information
description: |
Returns the information of a Mithril stake distribution
parameters:
- name: hash
in: path
description: Hash of the Mithril stake distribution to retrieve
required: true
schema:
type: string
format: bytes
example: "6da2b104ed68481ef829d72d72c2f6a20142916d17985e01774b14ed49f0fea1"
responses:
"200":
description: Mithril stake distribution found
content:
application/json:
schema:
$ref: "#/components/schemas/MithrilStakeDistributionMessage"
"404":
description: Mithril stake distribution not found
"412":
description: API version mismatch
default:
description: Mithril stake distribution retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/cardano-stake-distributions:
get:
summary: Get most recent Cardano stake distributions
description: |
Returns the list of the most recent Cardano stake distributions
responses:
"200":
description: Cardano stake distribution found
content:
application/json:
schema:
$ref: "#/components/schemas/CardanoStakeDistributionListMessage"
"412":
description: API version mismatch
default:
description: Cardano stake distribution retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/cardano-stake-distribution/{hash}:
get:
summary: Get Cardano stake distribution information
description: |
Returns the information of a Cardano stake distribution
parameters:
- name: hash
in: path
description: Hash of the Cardano stake distribution to retrieve
required: true
schema:
type: string
format: bytes
example: "6da2b104ed68481ef829d72d72c2f6a20142916d17985e01774b14ed49f0fea1"
responses:
"200":
description: Cardano stake distribution found
content:
application/json:
schema:
$ref: "#/components/schemas/CardanoStakeDistributionMessage"
"404":
description: Cardano stake distribution not found
"412":
description: API version mismatch
default:
description: Cardano stake distribution retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/cardano-stake-distribution/epoch/{epoch}:
get:
summary: Get Cardano stake distribution information for a specific epoch
description: |
Returns the information of a Cardano stake distribution at a given epoch
parameters:
- name: epoch
in: path
description: Epoch of the Cardano stake distribution to retrieve
required: true
schema:
type: integer
format: int64
example: 419
responses:
"200":
description: Cardano stake distribution found
content:
application/json:
schema:
$ref: "#/components/schemas/CardanoStakeDistributionMessage"
"404":
description: Cardano stake distribution not found
"412":
description: API version mismatch
default:
description: Cardano stake distribution retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/cardano-transactions:
get:
summary: Get most recent Cardano transactions set snapshots
description: |
Returns the list of the most recent Cardano transactions set snapshots
responses:
"200":
description: Cardano transactions set snapshots found
content:
application/json:
schema:
$ref: "#/components/schemas/CardanoTransactionSnapshotListMessage"
"412":
description: API version mismatch
default:
description: Cardano transactions set snapshots retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/artifact/cardano-transaction/{hash}:
get:
summary: Get Cardano transactions set snapshot information
description: |
Returns the information of a Cardano transactions set snapshot
parameters:
- name: hash
in: path
description: Hash of the Cardano transactions set snapshot to retrieve
required: true
schema:
type: string
format: bytes
example: "6da2b104ed68481ef829d72d72c2f6a20142916d17985e01774b14ed49f0fea1"
responses:
"200":
description: Cardano transactions set snapshot found
content:
application/json:
schema:
$ref: "#/components/schemas/CardanoTransactionSnapshotMessage"
"404":
description: Cardano transactions set snapshot not found
"412":
description: API version mismatch
default:
description: Cardano transactions set snapshot retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/proof/cardano-transaction:
get:
summary: Get the proofs of a Cardano transaction list
description: |
Returns the transaction hashes and the corresponding proofs
parameters:
- name: transaction_hashes
in: query
description: Hashes of the Cardano transactions to retrieve proofs for
required: true
schema:
type: array
items:
type: string
format: bytes
example: "6dbb104ed68481ef829a26a20142916d17985e01774d72d72c2f"
explode: false
responses:
"200":
description: Cardano transaction proofs found
content:
application/json:
schema:
$ref: "#/components/schemas/CardanoTransactionProofMessage"
"404":
description: No Cardano transactions were ever signed
"412":
description: API version mismatch
default:
description: Cardano transaction proofs retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/signers/registered/{epoch}:
get:
summary: Get registered signers for an epoch
description: |
Returns the signers that registered at a given Epoch
parameters:
- name: epoch
in: path
description: Cardano Epoch at which the signer registrations are registered
required: true
schema:
type: integer
format: int64
example: 419
responses:
"200":
description: Registered Signers found
content:
application/json:
schema:
$ref: "#/components/schemas/SignerRegistrationsMessage"
"404":
description: Registered Signers not found
"412":
description: API version mismatch
default:
description: Registered Signers retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/signers/tickers:
get:
summary: Get the signers known by the aggregator
description: |
Returns the signers party id and, if available, their pool ticker
responses:
"200":
description: Signers found
content:
application/json:
schema:
$ref: "#/components/schemas/SignersTickersMessage"
"412":
description: API version mismatch
default:
description: Signers retrieval error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/register-signer:
post:
summary: Registers signer
description: |
Registers a signer for the next certificate production
requestBody:
description: Signer information to register
required: true
content:
application/json:
schema:
$ref: "#/components/schemas/RegisterSignerMessage"
responses:
"201":
description: signer registration succeeded
"400":
description: signer registration bad request
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
"412":
description: API version mismatch
"503":
description: signer registration is unavailable
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
default:
description: signer registration error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/register-signatures:
post:
summary: Registers signatures
description: |
Registers the single signatures from a signer participant for the pending certificate
requestBody:
description: List of signatures
required: true
content:
application/json:
schema:
$ref: "#/components/schemas/RegisterSingleSignatureMessage"
responses:
"201":
description: signatures registration succeeded
"202":
description: signatures registration received and queued for later processing
"400":
description: signatures registration bad request
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
"404":
description: open message not found
"410":
description: signatures registration done too late
"412":
description: API version mismatch
default:
description: signatures registration error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
/statistics/snapshot:
post:
summary: Records snapshot download event
description: Records snapshot download event
requestBody:
description: Downloaded snapshot message
required: true
content:
application/json:
schema:
$ref: "#/components/schemas/SnapshotDownloadMessage"
responses:
"201":
description: Event successfully recorded
"400":
description: Record event bad request
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
"412":
description: API version mismatch
default:
description: Record event error
content:
application/json:
schema:
$ref: "#/components/schemas/Error"
components:
schemas:
AggregatorFeaturesMessage:
description: Represents general information about Aggregator public information and signing capabilities
type: object
additionalProperties: false
required:
- open_api_version
- documentation_url
- capabilities
properties:
open_api_version:
description: Open API version
type: string
format: byte
documentation_url:
description: Mithril documentation
type: string
format: byte
capabilities:
description: Capabilities of the aggregator
type: object
additionalProperties: false
required:
- signed_entity_types
properties:
signed_entity_types:
description: Signed entity types that are signed by the aggregator
type: array
minItems: 1
items:
description: Signed entity types that can be signed
type: string
enum:
- MithrilStakeDistribution
- CardanoStakeDistribution
- CardanoImmutableFilesFull
- CardanoTransactions
cardano_transactions_prover:
description: Cardano transactions prover capabilities
type: object
additionalProperties: false
required:
- max_hashes_allowed_by_request
properties:
max_hashes_allowed_by_request:
description: Maximum number of hashes allowed for a single request
type: integer
format: int64
cardano_transactions_signing_config:
description: |
Cardano transactions signing configuration
Mandatory if `signed_entity_types` contains `CardanoTransactions`.
type: object
additionalProperties: false
required:
- security_parameter
- step
properties:
security_parameter:
description: Number of blocks to discard from the tip of the chain when importing Cardano transactions
type: integer
format: int64
step:
description: Number of blocks between signature of Cardano transactions
type: integer
format: int64
example:
{
"open_api_version": "0.1.17",
"documentation_url": "https://mithril.network",
"capabilities":
{
"signed_entity_types":
[
"MithrilStakeDistribution",
"CardanoImmutableFilesFull",
"CardanoTransactions"
],
"cardano_transactions_prover":
{ "max_hashes_allowed_by_request": 100 },
"cardano_transactions_signing_config":
{ "security_parameter": 100, "step": 10 }
}
}
Epoch:
description: Cardano chain epoch number
type: integer
format: int64
EpochSettingsMessage:
description: Epoch settings
type: object
additionalProperties: false
required:
- epoch
- protocol
- next_protocol
- current_signers
- next_signers
properties:
epoch:
$ref: "#/components/schemas/Epoch"
protocol:
$ref: "#/components/schemas/ProtocolParameters"
next_protocol:
$ref: "#/components/schemas/ProtocolParameters"
current_signers:
type: array
items:
$ref: "#/components/schemas/Signer"
next_signers:
type: array
items:
$ref: "#/components/schemas/Signer"
cardano_transactions_signing_config:
$ref: "#/components/schemas/CardanoTransactionsSigningConfig"
next_cardano_transactions_signing_config:
$ref: "#/components/schemas/CardanoTransactionsSigningConfig"
example:
{
"epoch": 329,
"protocol": { "k": 857, "m": 6172, "phi_f": 0.2 },
"next_protocol": { "k": 2422, "m": 20973, "phi_f": 0.2 },
"current_signers":
[
{
"party_id": "1234567890",
"verification_key": "7b12766b223a5c342b39302c32392c39392c39382c3131313138342c32252c32352c31353",
"verification_key_signature": "7b5473693727369676d61223a7b227369676d6d61223a7b261223a9b227369676d61213a",
"operational_certificate": "5b73136372c38302c37342c3136362c313535b5b3232352c3230332c3235352c313030262c38322c39382c32c39332c3138342c3135362c3136362c32312c3131312c3232312c36332c3137372c3232332c3232332c31392c3537",
"kes_period": 123
},
{
"party_id": "2345678900",
"verification_key": "7b392c39392c13131312766b223a5c39382c313342b39302c252c32352c31353328342c32",
"verification_key_signature": "2c33302c3133312c3138322c34362c3133352c372c3139302c3235322c35352c32322c39",
"operational_certificate": "3231342c3137372c37312c3232352c3233332c3135335d2c322c3139322c5b3133352c34312c3230332c3131332c3c33352c3234302c3230392c312c32392c3233332c33342c3138382c3134312c3130342c3234382c3231392c3",
"kes_period": 456
}
],
"next_signers":
[
{
"party_id": "3456789000",
"verification_key": "7b22766b223a5b3133382c32392c3137332c3134342c36332c3233352c39372c3138302c3",
"verification_key_signature": "7b227369676d61223a7b227369676d61223a7b227369676d61223a7b227369676d612239",
"operational_certificate": "5b5b5b3232352c3230332c3235352c3130302c3136372c38302c37342c3136362c3135362c38322c39382c3232312c36332c3137372c3232332c3232332c31392c35372c39332c312c35302c3133392c3233342c3137332c32352",
"kes_period": 789
},
{
"party_id": "4567890000",
"verification_key": "34302c3132332c3139302c3134352c3132342c35342c3133302c37302c3136332c3139332",
"verification_key_signature": "302c3230312c38362c3139312c36302c3234352c3138332c3134342c3139392c3130335f",
"operational_certificate": "2c38382c3138372c3233332c34302c37322c31362c36365d2c312c3132332c5b31362c3136392c3134312c3138332c32322c3137342c3131312c33322c36342c35322c2c3232382c37392c3137352c32395312c3838282c323030",
"kes_period": 876
}
],
"cardano_transactions_signing_config":
{ "security_parameter": 100, "step": 10 },
"next_cardano_transactions_signing_config":
{ "security_parameter": 50, "step": 5 }
}
ProtocolParameters:
description: Protocol cryptographic parameters
type: object
additionalProperties: true
required:
- k
- m
- phi_f
properties:
k:
description: Quorum parameter
type: integer
format: int64
m:
description: Security parameter (number of lotteries)
type: integer
format: int64
phi_f:
description: f in phi(w) = 1 - (1 - f)^w, where w is the stake of a participant
type: number
format: double
example: { "k": 857, "m": 6172, "phi_f": 0.2 }
CardanoTransactionsSigningConfig:
description: Cardano transactions signing configuration
type: object
additionalProperties: false
required:
- security_parameter
- step
properties:
security_parameter:
description: Number of blocks to discard from the tip of the chain when importing Cardano transactions
type: integer
format: int64
step:
description: Number of blocks between signature of Cardano transactions
type: integer
format: int64
example: { "security_parameter": 100, "step": 10 }
CardanoDbBeacon:
description: A point in the Cardano chain at which a Mithril certificate of the Cardano Database should be produced
type: object
additionalProperties: true
required:
- network
- epoch
- immutable_file_number
properties:
network:
description: Cardano network
type: string
epoch:
$ref: "#/components/schemas/Epoch"
immutable_file_number:
description: Number of the last immutable file that should be included the snapshot
type: integer
format: int64
example:
{ "network": "mainnet", "epoch": 329, "immutable_file_number": 7060000 }
SignedEntityType:
description: Entity type of the message that is signed
type: object
additionalProperties: true
example: { "MithrilStakeDistribution": 246 }
CertificatePendingMessage:
description: CertificatePendingMessage represents all the information related to the certificate currently expecting to receive quorum of single signatures
type: object
additionalProperties: false
required:
- epoch
- entity_type
- protocol
- next_protocol
- signers
- next_signers
properties:
epoch:
$ref: "#/components/schemas/Epoch"
beacon:
deprecated: true
allOf:
- $ref: "#/components/schemas/CardanoDbBeacon"
entity_type:
$ref: "#/components/schemas/SignedEntityType"
protocol:
deprecated: true
allOf:
- $ref: "#/components/schemas/ProtocolParameters"
next_protocol:
deprecated: true
allOf:
- $ref: "#/components/schemas/ProtocolParameters"
signers:
deprecated: true
type: array
items:
$ref: "#/components/schemas/Signer"
next_signers:
deprecated: true
type: array
items:
$ref: "#/components/schemas/Signer"
example:
{
"epoch": 329,
"beacon":
{
"network": "mainnet",
"epoch": 329,
"immutable_file_number": 7060000
},
"entity_type": { "MithrilStakeDistribution": 246 },
"protocol": { "k": 857, "m": 6172, "phi_f": 0.2 },
"next_protocol": { "k": 2422, "m": 20973, "phi_f": 0.2 },
"signers":
[
{
"party_id": "1234567890",
"verification_key": "7b12766b223a5c342b39302c32392c39392c39382c3131313138342c32252c32352c31353",
"verification_key_signature": "7b5473693727369676d61223a7b227369676d6d61223a7b261223a9b227369676d61213a",
"operational_certificate": "5b73136372c38302c37342c3136362c313535b5b3232352c3230332c3235352c313030262c38322c39382c32c39332c3138342c3135362c3136362c32312c3131312c3232312c36332c3137372c3232332c3232332c31392c3537",
"kes_period": 123
},
{
"party_id": "2345678900",
"verification_key": "7b392c39392c13131312766b223a5c39382c313342b39302c252c32352c31353328342c32",
"verification_key_signature": "2c33302c3133312c3138322c34362c3133352c372c3139302c3235322c35352c32322c39",
"operational_certificate": "3231342c3137372c37312c3232352c3233332c3135335d2c322c3139322c5b3133352c34312c3230332c3131332c3c33352c3234302c3230392c312c32392c3233332c33342c3138382c3134312c3130342c3234382c3231392c3",
"kes_period": 456
}
],
"next_signers":
[
{
"party_id": "3456789000",
"verification_key": "7b22766b223a5b3133382c32392c3137332c3134342c36332c3233352c39372c3138302c3",
"verification_key_signature": "7b227369676d61223a7b227369676d61223a7b227369676d61223a7b227369676d612239",
"operational_certificate": "5b5b5b3232352c3230332c3235352c3130302c3136372c38302c37342c3136362c3135362c38322c39382c3232312c36332c3137372c3232332c3232332c31392c35372c39332c312c35302c3133392c3233342c3137332c32352",
"kes_period": 789
},
{
"party_id": "4567890000",
"verification_key": "34302c3132332c3139302c3134352c3132342c35342c3133302c37302c3136332c3139332",
"verification_key_signature": "302c3230312c38362c3139312c36302c3234352c3138332c3134342c3139392c3130335f",
"operational_certificate": "2c38382c3138372c3233332c34302c37322c31362c36365d2c312c3132332c5b31362c3136392c3134312c3138332c32322c3137342c3131312c33322c36342c35322c2c3232382c37392c3137352c32395312c3838282c323030",
"kes_period": 876
}
]
}
Stake:
description: Stake represents the stakes of a participant in the Cardano chain
type: object
additionalProperties: true
required:
- stake
properties:
stake:
description: Stake share as computed in the 'stake distribution' by the Cardano Node, multiplied by a billion (1.0e9)
type: integer
format: int64
example: { "stake": 1234 }
Signer:
description: Signer represents a signing participant in the network
type: object
additionalProperties: true
required:
- party_id
- verification_key
properties:
party_id:
description: The unique identifier of the signer
type: string
verification_key:
description: The public key used to authenticate signer signature
type: string
format: byte
verification_key_signature:
description: The signature of the verification_key (signed by the Cardano node KES secret key)
type: string
format: byte
operational_certificate:
description: The operational certificate of the stake pool operator attached to the signer node
type: string
format: byte
kes_period:
description: The number of updates of the KES secret key that signed the verification key
type: integer
format: int64
example:
{
"party_id": "1234567890",
"verification_key": "7b12766b223a5c342b39302c32392c39392c39382c3131313138342c32252c32352c31353",
"verification_key_signature": "7b5473693727369676d61223a7b227369676d6d61223a7b261223a9b227369676d61213a",
"operational_certificate": "5b73136372c38302c37342c3136362c313535b5b3232352c3230332c3235352c313030262c38322c39382c32c39332c3138342c3135362c3136362c32312c3131312c3232312c36332c3137372c3232332c3232332c31392c3537",
"kes_period": 123
}
RegisterSignerMessage:
description: This message represents a signing participant in the network.
additionalProperties: true
properties:
epoch:
$ref: "#/components/schemas/Epoch"
allOf:
- $ref: "#/components/schemas/Signer"
example: