blockdata:: transaction:: Transaction
A Bitcoin transaction, which describes an authenticated movement of coins.
If any inputs have nonempty witnesses, the entire transaction is serialized in the post-BIP141 Segwit format which includes a list of witnesses. If all inputs have empty witnesses, the transaction is serialized in the pre-BIP141 format.
There is one major exception to this: to avoid deserialization ambiguity, if the transaction has no inputs, it is serialized in the BIP141 style. Be aware that this differs from the transaction format in PSBT, which never uses BIP141. (Ordinarily there is no conflict, since in PSBT transactions are always unsigned and therefore their inputs have empty witnesses.)
The specific ambiguity is that Segwit uses the flag bytes
0001 where an old
serializer would read the number of transaction inputs. The old serializer
would interpret this as "no inputs, one output", which means the transaction
is invalid, and simply reject it. Segwit further specifies that this encoding
should only be used when some input has a nonempty witness; that is,
witness-less transactions should be encoded in the traditional format.
However, in protocols where transactions may legitimately have 0 inputs, e.g.
when parties are cooperatively funding a transaction, the "00 means Segwit"
heuristic does not work. Since Segwit requires such a transaction be encoded
in the original transaction format (since it has no inputs and therefore
no input witnesses), a traditionally encoded transaction may have the
Segwit flag in it, which confuses most Segwit parsers including the one in
We therefore deviate from the spec by always using the Segwit witness encoding for 0-input transactions, which results in unambiguously parseable transactions.
The protocol version, is currently expected to be 1 or 2 (BIP 68).
Block number before which this transaction is valid, or 0 for valid immediately.
List of inputs
List of outputs
Computes a "normalized TXID" which does not include any signatures. This gives a way to identify a transaction that is ``the same'' as another in the sense of having same inputs and outputs.
Computes the txid. For non-segwit transactions this will be identical
to the output of
wtxid(), but for segwit transactions,
this will give the correct txid (not including witnesses) while
will also hash witnesses.
Computes SegWit-version of the transaction id (wtxid). For transaction with the witness data this hash includes witness, for pre-witness transaction it is equal to the normal value returned by txid() function.
pub fn signature_hash([src]
) -> SigHash
) -> SigHash
Computes a signature hash for a given input index with a given sighash flag. To actually produce a scriptSig, this hash needs to be run through an ECDSA signer, the SigHashType appended to the resulting sig, and a script written around this, but this is the general (and hard) part.
Warning This does NOT attempt to support OP_CODESEPARATOR. In general
this would require evaluating
script_pubkey to determine which separators
get evaluated and which don't, which we don't have the information to
input_index is greater than or equal to
pub fn get_weight(&self) -> usize[src]
Gets the "weight" of this transaction, as defined by BIP141. For transactions with an empty witness, this is simply the consensus-serialized size times 4. For transactions with a witness, this is the non-witness consensus-serialized size multiplied by 3 plus the with-witness consensus-serialized size.
Gets the regular byte-wise consensus-serialized size of this transaction.
pub fn is_coin_base(&self) -> bool[src]
Is this a coin base transaction?
impl Clone for Transaction[src]
impl Debug for Transaction[src]
impl Decodable for Transaction[src]
impl Deserialize for Transaction[src]
impl Encodable for Transaction[src]
impl Eq for Transaction[src]
impl Hash for Transaction[src]
fn hash_slice<H>(data: &[Self], state: &mut H) where1.3.0[src]
impl PartialEq<Transaction> for Transaction[src]
impl Serialize for Transaction[src]
impl StructuralEq for Transaction[src]
impl StructuralPartialEq for Transaction[src]
impl RefUnwindSafe for Transaction
impl Send for Transaction
impl Sync for Transaction
impl Unpin for Transaction
impl UnwindSafe for Transaction
type Owned = T
The resulting type after obtaining ownership.
fn clone_into(&self, target: &mut T)[src]
type Error = Infallible
The type returned in the event of a conversion error.