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XChainOwnedClaimID

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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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An XChainOwnedClaimID object represents one cross-chain transfer of value and includes information of the account on the source chain that locks or burns the funds on the source chain.

The XChainOwnedClaimID object must be acquired on the destination chain before submitting a XChainCommit on the source chain. Its purpose is to prevent transaction replay attacks and is also used as a place to collect attestations from witness servers.

An XChainCreateClaimID transaction is used to create a new XChainOwnedClaimID. The ledger object is destroyed when the funds are successfully claimed on the destination chain.

Example XChainOwnedClaimID JSON

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{
  "Account": "rBW1U7J9mEhEdk6dMHEFUjqQ7HW7WpaEMi",
  "Flags": 0,
  "OtherChainSource": "r9oXrvBX5aDoyMGkoYvzazxDhYoWFUjz8p",
  "OwnerNode": "0",
  "PreviousTxnID": "1CFD80E9CF232B8EED62A52857DE97438D12230C06496932A81DEFA6E66070A6",
  "PreviousTxnLgrSeq": 58673,
  "SignatureReward": "100",
  "XChainBridge": {
    "IssuingChainDoor": "rHb9CJAWyB4rj91VRWn96DkukG4bwdtyTh",
    "IssuingChainIssue": {
      "currency": "XRP"
    },
    "LockingChainDoor": "rMAXACCrp3Y8PpswXcg3bKggHX76V3F8M4",
    "LockingChainIssue": {
      "currency": "XRP"
    }
  },
  "XChainClaimAttestations": [
    {
      "XChainClaimProofSig": {
        "Amount": "1000000",
        "AttestationRewardAccount": "rfgjrgEJGDxfUY2U8VEDs7BnB1jiH3ofu6",
        "AttestationSignerAccount": "rfsxNxZ6xB1nTPhTMwQajNnkCxWG8B714n",
        "Destination": "rBW1U7J9mEhEdk6dMHEFUjqQ7HW7WpaEMi",
        "PublicKey": "025CA526EF20567A50FEC504589F949E0E3401C13EF76DD5FD1CC2850FA485BD7B",
        "WasLockingChainSend": 1
      }
    },
    {
      "XChainClaimProofSig": {
        "Amount": "1000000",
        "AttestationRewardAccount": "rUUL1tP523M8KimERqVS7sxb1tLLmpndyv",
        "AttestationSignerAccount": "rEg5sHxZVTNwRL3BAdMwJatkmWDzHMmzDF",
        "Destination": "rBW1U7J9mEhEdk6dMHEFUjqQ7HW7WpaEMi",
        "PublicKey": "03D40434A6843638681E2F215310EBC4131AFB12EA85985DA073183B732525F7C9",
        "WasLockingChainSend": 1
      },
    }
  ],
  "XChainClaimID": "b5",
  "LedgerEntryType": "XChainOwnedClaimID",
  "LedgerIndex": "20B136D7BF6D2E3D610E28E3E6BE09F5C8F4F0241BBF6E2D072AE1BACB1388F5"
}

XChainOwnedClaimID Fields

Field JSON Type Internal Type Required? Description
Account string ACCOUNT Yes The account that owns this object.
LedgerIndex string HASH256 Yes The ledger index is a hash of a unique prefix for XChainOwnedClaimIDs, the actual XChainClaimID value, and the fields in XChainBridge.
OtherChainSource string ACCOUNT Yes The account that must send the corresponding XChainCommit on the source chain. The destination may be specified in the XChainCommit transaction, which means that if the OtherChainSource isn't specified, another account can try to specify a different destination and steal the funds. This also allows tracking only a single set of signatures, since we know which account will send the XChainCommit transaction.
SignatureReward Currency Amount AMOUNT Yes The total amount to pay the witness servers for their signatures. It must be at least the value of SignatureReward in the Bridge ledger object.
XChainBridge XChainBridge XCHAIN_BRIDGE Yes The door accounts and assets of the bridge this object correlates to.
XChainClaimAttestations array ARRAY Yes Attestations collected from the witness servers. This includes the parameters needed to recreate the message that was signed, including the amount, which chain (locking or issuing), optional destination, and reward account for that signature.
XChainClaimID string UINT64 Yes The unique sequence number for a cross-chain transfer.

XChainClaimAttestations

Field JSON Type Internal Type Required Description
XChainClaimProofSig array OBJECT Yes An attestation from one witness server.
Amount Currency Amount AMOUNT Yes The amount to claim in the XChainCommit transaction on the destination 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 No The destination account for the funds on the destination chain.
PublicKey string BLOB Yes The public key used to verify the signature.
WasLockingChainSend number UINT8 Yes A boolean representing the chain where the event occurred.

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.