Function getSequenceChallenge

Gets the challenge hash for the provided transaction, sequence ID.

geod24.bitblob.BitBlob!(64L) getSequenceChallenge (
  in ref const(Transaction) tx,
  in const(ulong) sequence,
  in const(ulong) input_idx,
  in const(ulong) output_idx = 0LU,
  SigHash sig_hash = SigHash.NoInput
) nothrow @safe;

Parameters

NameDescription
tx the transaction to sign
sequence the sequence ID to hash
input_idx the associated input index we're signing for

Returns

the challenge as a hash

Example

OP.HASH_SHA256 

scope engine = new Engine();
const tx = Transaction([Input.init], [Output.init]);

// sha256 hash of "abc"
ubyte[32] hash = [0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA, 0x41,
0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23, 0xB0, 0x03, 0x61, 0xA3, 0x96,
0x17, 0x7A, 0x9C, 0xB4, 0x10, 0xFF, 0x61, 0xF2, 0x00, 0x15, 0xAD];
assert(engine.execute(
    Lock(LockType.Script, [ubyte(OP.HASH_SHA256)] ~
    toPushOpcode(hash) ~ [ubyte(OP.CHECK_EQUAL)]),
    Unlock([ubyte(3), ubyte('a'), ubyte('b'), ubyte('c')]),
    tx, Input.init) is null);