ExportSignatures

ExportSignatures is a pseudo-transaction derived from the agreed Export signature sidecar. It records a canonical quorum witness for an earlier validated Export intent.

The witness is not part of the original Export transaction’s metadata. It appears in the earliest later eligible ledger where the sidecar converges on a valid quorum, subject to the Export latch’s publication deadline.

Example

{
  "TransactionType": "ExportSignatures",
  "Account": "rrrrrrrrrrrrrrrrrrrrrhoLvTp",
  "Fee": "0",
  "Sequence": 0,
  "SigningPubKey": "",
  "LedgerSequence": 12345682,
  "TransactionHash": "[W]",
  "ExportedTxn": {
    "TransactionType": "Payment",
    "Account": "rYourAccount...",
    "Sequence": 0,
    "TicketSequence": 2,
    "SigningPubKey": "",
    "Memos": ["[CALLER_MEMOS_THEN_FINAL_XAHAU_EXPORT_MEMO]"]
  },
  "ExportContributors": "01",
  "ExportSigners": [
    {
      "ExportSigner": {
        "SigningPubKey": "[VALIDATOR_SIGNING_PUBLIC_KEY]",
        "TxnSignature": "[HEX_SIGNATURE]"
      }
    }
  ]
}

Fields

Field	JSON Type	Internal Type	Description
`LedgerSequence`	Number	UInt32	Ledger index containing this witness.
`TransactionHash`	String	Hash256	W, the source Export transaction hash.
`ExportedTxn`	Object	STObject	Exact unsigned release-stamped target transaction signed by the validators. It has an empty `SigningPubKey` and no `Signers` or `TxnSignature`.
`ExportContributors`	String	Blob	Exact-width LSB-first bitmap over the immutable ExportCommittee’s canonical roster, identifying the positions represented in `ExportSigners`.
`ExportSigners`	Array	STArray	Validator signing public keys and multisignatures. Entries correspond in order to the set contributor positions from lowest to highest.

The contributor bitmap’s population must equal the number of signer entries and satisfy ceil(0.8 * committee size). Duplicate signing keys and duplicate signer AccountIDs are invalid, and every signature is verified against the stored release-stamped transaction.

Release Stamp

The final xahau/export Memo commits to:

Version and flags.
Source and target network IDs.
W.
The validated source ledger sequence and hash.

The Memo must be final. Caller-supplied Memos, if any, precede it unchanged. On replay, the witness and ExportLatch provide deterministic state; a node does not need mutable historical manifest state to re-decide the accepted witness.

Assembly

To construct the target-chain transaction from a witness:

Start with the witness ExportedTxn exactly as stored.
Derive each Signer.Account from its SigningPubKey.
Add the key and TxnSignature to that Signer entry.
Sort the Signers array by AccountID.
Leave the top-level SigningPubKey empty.

Latch Effect

If the matching latch exists and XPOP has not arrived, the witness hash is stored as ExportSignatureHash and the latch leaves the pending directory. If XPOP arrived first, witness application erases the latch and releases its reserve. A concurrently ordered explicit erase can leave the historical witness with no remaining latch state.

Common Fields

As a pseudo-transaction, ExportSignatures uses the standard pseudo-transaction values:

Field	Value
`Account`	`rrrrrrrrrrrrrrrrrrrrrhoLvTp` (`ACCOUNT_ZERO`)
`Fee`	`0`
`Sequence`	`0`
`SigningPubKey`	`""`
`TxnSignature`	Absent or empty.