XChainAddAccountCreateAttestation

Attention

Cross-chain bridges functionality is part of the proposed XLS-38d extension (Not Enabled) to the XRP Ledger protocol. There isn't an official amendment yet. Until there is an amendment, the details documented on these pages are subject to change frequently. [Source]

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[Source]

The XChainAddAccountCreateAttestation transaction provides an attestation from a witness server that a XChainAccountCreateCommit transaction occurred on the other chain.

The signature must be from one of the keys on the door's signer list at the time the signature was provided. If the signature list changes between the time the signature was submitted and the quorum is reached, the new signature set is used and some of the currently collected signatures may be removed.

Any account can submit signatures.

Note: The reward is only sent to accounts that have keys on the current list. A quorum of signers need to agree on the SignatureReward, the same way they need to agree on the other data. A single witness server can't provide an incorrect value for this in an attempt to collect a larger reward.

Example XChainAddAccountCreateAttestation JSON

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{
  "Account": "rDr5okqGKmMpn44Bbhe5WAfDQx8e9XquEv",
  "TransactionType": "XChainAddAccountCreateAttestation",
  "OtherChainSource": "rUzB7yg1LcFa7m3q1hfrjr5w53vcWzNh3U",
  "Destination": "rJMfWNVbyjcCtds8kpoEjEbYQ41J5B6MUd",
  "Amount": "2000000000",
  "PublicKey": "EDF7C3F9C80C102AF6D241752B37356E91ED454F26A35C567CF6F8477960F66614",
  "Signature": "F95675BA8FDA21030DE1B687937A79E8491CE51832D6BEEBC071484FA5AF5B8A0E9AFF11A4AA46F09ECFFB04C6A8DAE8284AF3ED8128C7D0046D842448478500",
  "WasLockingChainSend": 1,
  "AttestationRewardAccount": "rpFp36UHW6FpEcZjZqq5jSJWY6UCj3k4Es",
  "AttestationSignerAccount": "rpWLegmW9WrFBzHUj7brhQNZzrxgLj9oxw",
  "XChainAccountCreateCount": "2",
  "SignatureReward": "204",
  "XChainBridge": {
    "LockingChainDoor": "r3nCVTbZGGYoWvZ58BcxDmiMUU7ChMa1eC",
    "LockingChainIssue": {
      "currency": "XRP"
    },
    "IssuingChainDoor": "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh",
    "IssuingChainIssue": {
      "currency": "XRP"
    }
  },
  "Fee": "20"
}

XChainAddAccountCreateAttestation Fields

Field	JSON Type	Internal Type	Required?	Description
`Amount`	`Currency Amount`	`AMOUNT`	Yes	The amount committed by the `XChainAccountCreateCommit` transaction on the source chain.
`AttestationRewardAccount`	`string`	`ACCOUNT`	Yes	The account that should receive this signer's share of the `SignatureReward`.
`AttestationSignerAccount`	`string`	`ACCOUNT`	Yes	The account on the door account's signer list that is signing the transaction.
`Destination`	`string`	`ACCOUNT`	Yes	The destination account for the funds on the destination chain.
`OtherChainSource`	`string`	`ACCOUNT`	Yes	The account on the source chain that submitted the `XChainAccountCreateCommit` transaction that triggered the event associated with the attestation.
`PublicKey`	`string`	`BLOB`	Yes	The public key used to verify the signature.
`Signature`	`string`	`BLOB`	Yes	The signature attesting to the event on the other chain.
`SignatureReward`	`Currency Amount`	`AMOUNT`	Yes	The signature reward paid in the `XChainAccountCreateCommit` transaction.
`WasLockingChainSend`	`number`	`UINT8`	Yes	A boolean representing the chain where the event occurred.
`XChainAccountCreateCount`	`string`	`UINT64`	Yes	The counter that represents the order that the claims must be processed in.
`XChainBridge`	`XChainBridge`	`XCHAIN_BRIDGE`	Yes	The bridge associated with the attestation.

XChainBridge Fields

Field	JSON Type	Internal Type	Required?	Description
`IssuingChainDoor`	`string`	`ACCOUNT`	Yes	The door account on the issuing chain. For an XRP-XRP bridge, this must be the genesis account (the account that is created when the network is first started, which contains all of the XRP).
`IssuingChainIssue`	`Issue`	`ISSUE`	Yes	The asset that is minted and burned on the issuing chain. For an IOU-IOU bridge, the issuer of the asset must be the door account on the issuing chain, to avoid supply issues.
`LockingChainDoor`	`string`	`ACCOUNT`	Yes	The door account on the locking chain.
`LockingChainIssue`	`Issue`	`ISSUE`	Yes	The asset that is locked and unlocked on the locking chain.

XCHAIN_BRIDGE Field Type

XCHAIN_BRIDGE is a new field type introduced by XLS-38d.

Type Name	Type Code	Bit Length	Length-prefixed?	Description
`XCHAIN_BRIDGE`	25	Variable	No	A bridge between two blockchains, identified by the door accounts and issued assets on the locking chain and issuing chain. `XCHAIN_BRIDGE` is serialized in this order: locking chain door, locking chain issue, issuing chain door, issuing chain issue.