PreconditionsV2Xdr

// Transaction only valid for ledger numbers n such that
// minLedger <= n < maxLedger (if maxLedger == 0, then
// only minLedger is checked)
LedgerBounds* ledgerBounds;

// If NULL, only valid when sourceAccount's sequence number
// is seqNum - 1.  Otherwise, valid when sourceAccount's
// sequence number n satisfies minSeqNum <= n < tx.seqNum.
// Note that after execution the account's sequence number
// is always raised to tx.seqNum, and a transaction is not
// valid if tx.seqNum is too high to ensure replay protection.
SequenceNumber* minSeqNum;

// For the transaction to be valid, the current ledger time must
// be at least minSeqAge greater than sourceAccount's seqTime.
Duration minSeqAge;

// For the transaction to be valid, the current ledger number
// must be at least minSeqLedgerGap greater than sourceAccount's
// seqLedger.
uint32 minSeqLedgerGap;

// For the transaction to be valid, there must be a signature
// corresponding to every Signer in this array, even if the
// signature is not otherwise required by the sourceAccount or
// operations.
SignerKey extraSigners<2>;