exoticMerkleProof function

Implementation

({
  int proofDepth,
  Uint8List proofHash,
}) exoticMerkleProof(BitString bits, List<Cell> refs) {
  final reader = BitReader(bits);

  // type + hash + depth
  if (bits.length != 8 + 256 + 16) {
    throw 'Merkle Proof cell must have exactly (8 + 256 + 16) bits, got ${bits.length}';
  }

  if (refs.length != 1) {
    throw 'Merkle Proof cell must have exactly 1 reference, got ${refs.length}';
  }

  var type = reader.loadUint(8);
  if (type != 3) {
    throw 'Merkle Proof cell must have type 3, got $type';
  }

  final proofHash = reader.loadList(32);
  final proofDepth = reader.loadUint(16);
  final refHash = refs[0].hash(0);
  final refDepth = refs[0].depth(0);

  if (proofDepth != refDepth) {
    throw 'Merkle Proof cell reference depth must be exactly $proofDepth, got $refDepth';
  }

  if (!proofHash.equals(refHash)) {
    throw 'Merkle Proof cell reference hash must be exactly ${hex.encode(proofHash)}, got ${hex.encode(refHash)}';
  }

  return (
    proofDepth: proofDepth,
    proofHash: proofHash,
  );
}