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.