TxAssembler class

High-level transaction builder that takes UTXOs, outputs, and a chain config to produce a fully-signed Tx.

For new code prefer the wallet-layer builder; this type is retained for the chains barrel API. Unlike its previous (broken) incarnation, build / buildAsync now attach the produced signatures and return a transaction with complete == true.

Implementers

Constructors

TxAssembler({required ChainParams chainParams, required List<AssemblerInput> inputs, required List<TxOutput> outputs, int version = Tx.currentVersion, int locktime = 0, TxOrdering ordering = TxOrdering.bip69})

Properties

chainParams → ChainParams
final
hashCode → int
The hash code for this object.
no setterinherited
inputs → List<AssemblerInput>
final
locktime → int
final
ordering → TxOrdering
final
outputs → List<TxOutput>
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
version → int
final

Methods

build(SignerCallback signer) → Tx
Builds and signs the transaction synchronously.
buildAsync(AsyncSignerCallback signer) → Future<Tx>
Async variant of build for hardware wallets / remote signers.
buildSignedInput(AssemblerInput meta, Uint8List derSig) → TxInput
Builds the concrete signed TxInput for meta from the DER signature bytes returned by the signer (no sighash flag appended yet).
compareBytes(Uint8List a, Uint8List b) → int
computeDigest(Tx tx, int index, AssemblerInput meta) → Uint8List
Computes the sighash digest for the input, choosing the algorithm and - for segwit - the BIP-143 scriptCode based on AssemblerInput.type.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
orderedInputs() → List<AssemblerInput>
orderedOutputs() → List<TxOutput>
p2wpkhScriptCode(AssemblerInput meta) → Uint8List
BIP-143 scriptCode for P2WPKH / nested P2WPKH: OP_DUP OP_HASH160 <20-byte keyhash> OP_EQUALVERIFY OP_CHECKSIG.
toString() → String
A string representation of this object.
inherited
unsignedTx(List<AssemblerInput> ins, List<TxOutput> outs) → Tx

Operators

operator ==(Object other) → bool
The equality operator.
inherited