The descriptor string in ASCII format. It may include a "*" to denote an arbitrary index (aka ranged descriptors).
Optional index?: numberThe descriptor's index in the case of a range descriptor (must be an integer >=0).
Optional checksumAn optional flag indicating whether the descriptor is required to include a checksum.
false
Optional allowA flag indicating whether this instance can parse and generate script satisfactions for sh(miniscript) top-level expressions of miniscripts. This is not recommended.
false
Optional network?: NetworkOne of bitcoinjs-lib networks (or another one following the same interface).
networks.bitcoin
Optional preimages?: Preimage[]An array of preimages if the miniscript-based descriptor uses them.
This info is necessary to finalize Psbts. Leave it undefined if your
miniscript-based descriptor does not use preimages or you don't know
or don't wanto use them.
You can also leave it undefined if only need to generate the
scriptPubKey or address for a descriptor.
[]
Optional signersAn array of the public keys used for signing the transaction when spending the previous output associated with this descriptor.
This parameter is only used if the descriptor object is being used to finalize a transaction. It is necessary to specify the spending path when working with miniscript-based expressions that have multiple spending paths.
Set this parameter to an array containing the public
keys involved in the desired spending path. Leave it undefined if you
only need to generate the scriptPubKey or address for a descriptor,
or if all the public keys involved in the descriptor will sign the
transaction. In the latter case, the satisfier will automatically
choose the most optimal spending path (if more than one is available).
For more details on using this parameter, refer to this Stack Exchange answer.
Private Readonly #paymentPrivate Readonly #preimagesPrivate Readonly #signersPrivate Optional Readonly #miniscriptPrivate Optional Readonly #witnessPrivate Optional Readonly #redeemPrivate Optional Readonly #isPrivate Optional Readonly #expandedPrivate Optional Readonly #expandedPrivate Optional Readonly #expansionPrivate Readonly #networkPrivate #getGets the TimeConstraints (nSequence and nLockTime) of the miniscript descriptor as passed in the constructor, just using the expression, the signersPubKeys and preimages.
We just need to know which will be the signatures that will be used (signersPubKeys) but final signatures are not necessary for obtaning nLockTime and nSequence.
Remember: nSequence and nLockTime are part of the hash that is signed. Thus, they must not change after computing the signatures. When running getScriptSatisfaction, using the final signatures, satisfyMiniscript verifies that the time constraints did not change.
Creates and returns an instance of bitcoinjs-lib
Payment's interface with the scriptPubKey of this Output.
Returns the compiled Script Satisfaction if this Output was created
using a miniscript-based descriptor.
The Satisfaction is the unlocking script that fulfills
(satisfies) this Output and it is derived using the Safisfier algorithm
described here.
Important: As mentioned above, note that this function only applies to miniscript descriptors.
An array with all the signatures needed to
build the Satisfaction of this miniscript-based Output.
signatures must be passed using this format (pairs of pubKey/signature):
interface PartialSig { pubkey: Buffer; signature: Buffer; }
'DANGEROUSLY_USE_FAKE_SIGNATURES'. This will generate script satisfactions
using 72-byte zero-padded signatures. While this can be useful in
modules like coinselector that require estimating transaction size before
signing, it is critical to understand the risks:⚠️ Warning: Misuse of 'DANGEROUSLY_USE_FAKE_SIGNATURES' can lead to security vulnerabilities, including but not limited to invalid transaction generation. Ensure you fully understand the implications before use.
Gets the bitcoinjs-lib network used to create this Output.
Sets this output as an input of the provided psbt and updates the
psbt locktime if required by the descriptor.
psbt and vout are mandatory. Include txHex as well. The pair
vout and txHex define the transaction and output number this instance
pertains to.
Though not advised, for Segwit inputs you can pass txId and value
in lieu of txHex. If doing so, ensure value accuracy to avoid
potential fee attacks -
See this issue.
Note: Hardware wallets need the full txHex for Segwit.
When unsure, always use txHex, and skip txId and value for safety.
Optional txOptional txOptional value?: numberA finalizer function to be used after signing the psbt.
This function ensures that this input is properly finalized.
The finalizer has this signature:
( { psbt, validate = true } : { psbt: Psbt; validate: boolean | undefined } ) => void
Optional validate?: booleanRuns further test on the validity of the signatures. It speeds down the finalization process but makes sure the psbt will be valid.
true
Private #assertFinalizes a PSBT input by adding the necessary unlocking script that satisfies this Output's
spending conditions.
🔴 IMPORTANT 🔴
It is STRONGLY RECOMMENDED to use the finalizer function returned by
updatePsbtAsInput instead
of calling this method directly.
This approach eliminates the need to manage the Output instance and the
input's index, simplifying the process.
The finalizePsbtInput method completes a PSBT input by adding the
unlocking script (scriptWitness or scriptSig) that satisfies
this Output's spending conditions. Bear in mind that both
scriptSig and scriptWitness incorporate signatures. As such, you
should complete all necessary signing operations before calling this
method.
For each unspent output from a previous transaction that you're
referencing in a psbt as an input to be spent, apply this method as
follows: output.finalizePsbtInput({ index, psbt }).
It's essential to specify the exact position (or index) of the input in
the psbt that references this unspent Output. This index should
align with the value returned by the updatePsbtAsInput method.
Note:
The index corresponds to the position of the input in the psbt.
To get this index, right after calling updatePsbtAsInput(), use:
index = psbt.data.inputs.length - 1.
Optional validate?: booleanRuns further test on the validity of the signatures. It speeds down the finalization process but makes sure the psbt will be valid.
true
Decomposes the descriptor used to form this Output into its elemental
parts. See ExpansionMap for a detailed explanation.
Optional expandedOptional miniscript?: stringOptional expandedOptional expansion
The
Outputclass is the central component for managing descriptors. It facilitates the creation of outputs to receive funds and enables the signing and finalization of PSBTs (Partially Signed Bitcoin Transactions) for spending UTXOs (Unspent Transaction Outputs).