Constructor Detail

• TxBuilder

  TxBuilder(Pointer pointer)

• TxBuilder

  TxBuilder(NoPointer noPointer)

  This constructor can be used to instantiate a fake object.

• TxBuilder

  TxBuilder()

Method Detail

• destroy

   Unit destroy()

• close

   Unit close()

• uniffiClonePointer

   final Pointer uniffiClonePointer()

• addData

   TxBuilder addData(ByteArray data)

  Add data as an output using OP_RETURN.

• addGlobalXpubs

   TxBuilder addGlobalXpubs()

  Fill-in the PSBT_GLOBAL_XPUB field with the extended keys contained in both the external and internal descriptors.

  This is useful for offline signers that take part to a multisig. Some hardware wallets like BitBox and ColdCard are known to require this.

• addRecipient

   TxBuilder addRecipient(Script script, Amount amount)

  Add a recipient to the internal list of recipients.

• addUnspendable

   TxBuilder addUnspendable(OutPoint unspendable)

  Add a utxo to the internal list of unspendable utxos.

  It’s important to note that the "must-be-spent" utxos added with TxBuilder::add_utxo have priority over this.

• addUtxo

   TxBuilder addUtxo(OutPoint outpoint)

  Add a utxo to the internal list of utxos that must be spent.

  These have priority over the "unspendable" utxos, meaning that if a utxo is present both in the "utxos" and the "unspendable" list, it will be spent.

• addUtxos

   TxBuilder addUtxos(List<OutPoint> outpoints)

  Add the list of outpoints to the internal list of UTXOs that must be spent.

• allowDust

   TxBuilder allowDust(Boolean allowDust)

  Set whether or not the dust limit is checked.

  Note: by avoiding a dust limit check you may end up with a transaction that is non-standard.

• changePolicy

   TxBuilder changePolicy(ChangeSpendPolicy changePolicy)

  Set a specific ChangeSpendPolicy. See TxBuilder::do_not_spend_change and TxBuilder::only_spend_change for some shortcuts. This method assumes the presence of an internal keychain, otherwise it has no effect.

• currentHeight

   TxBuilder currentHeight(UInt height)

  Set the current blockchain height.

  This will be used to:

  • Set the nLockTime for preventing fee sniping. Note: This will be ignored if you manually specify a nlocktime using TxBuilder::nlocktime.

  • Decide whether coinbase outputs are mature or not. If the coinbase outputs are not mature at current_height, we ignore them in the coin selection. If you want to create a transaction that spends immature coinbase inputs, manually add them using TxBuilder::add_utxos. In both cases, if you don’t provide a current height, we use the last sync height.

• doNotSpendChange

   TxBuilder doNotSpendChange()

  Do not spend change outputs.

  This effectively adds all the change outputs to the "unspendable" list. See TxBuilder::unspendable. This method assumes the presence of an internal keychain, otherwise it has no effect.

• drainTo

   TxBuilder drainTo(Script script)

  Sets the address to drain excess coins to.

  Usually, when there are excess coins they are sent to a change address generated by the wallet. This option replaces the usual change address with an arbitrary script_pubkey of your choosing. Just as with a change output, if the drain output is not needed (the excess coins are too small) it will not be included in the resulting transaction. The only difference is that it is valid to use drain_to without setting any ordinary recipients with add_recipient (but it is perfectly fine to add recipients as well).

  If you choose not to set any recipients, you should provide the utxos that the transaction should spend via add_utxos. drain_to is very useful for draining all the coins in a wallet with drain_wallet to a single address.

• drainWallet

   TxBuilder drainWallet()

  Spend all the available inputs. This respects filters like TxBuilder::unspendable and the change policy.

• feeAbsolute

   TxBuilder feeAbsolute(Amount feeAmount)

  Set an absolute fee The fee_absolute method refers to the absolute transaction fee in Amount. If anyone sets both the fee_absolute method and the fee_rate method, the FeePolicy enum will be set by whichever method was called last, as the FeeRate and FeeAmount are mutually exclusive.

  Note that this is really a minimum absolute fee – it’s possible to overshoot it slightly since adding a change output to drain the remaining excess might not be viable.

• feeRate

   TxBuilder feeRate(FeeRate feeRate)

  Set a custom fee rate.

  This method sets the mining fee paid by the transaction as a rate on its size. This means that the total fee paid is equal to fee_rate times the size of the transaction. Default is 1 sat/vB in accordance with Bitcoin Core’s default relay policy.

  Note that this is really a minimum feerate – it’s possible to overshoot it slightly since adding a change output to drain the remaining excess might not be viable.

• finish

   Psbt finish(Wallet wallet)

  Finish building the transaction.

  Uses the thread-local random number generator (rng).

  Returns a new Psbt per BIP174.

  WARNING: To avoid change address reuse you must persist the changes resulting from one or more calls to this method before closing the wallet. See Wallet::reveal_next_address.

• manuallySelectedOnly

   TxBuilder manuallySelectedOnly()

  Only spend utxos added by TxBuilder::add_utxo.

  The wallet will not add additional utxos to the transaction even if they are needed to make the transaction valid.

• nlocktime

   TxBuilder nlocktime(LockTime locktime)

  Use a specific nLockTime while creating the transaction.

  This can cause conflicts if the wallet’s descriptors contain an "after" (OP_CLTV) operator.

• onlySpendChange

   TxBuilder onlySpendChange()

  Only spend change outputs.

  This effectively adds all the non-change outputs to the "unspendable" list. See TxBuilder::unspendable. This method assumes the presence of an internal keychain, otherwise it has no effect.

• policyPath

   TxBuilder policyPath(Map<String, List<ULong>> policyPath, KeychainKind keychain)

  The TxBuilder::policy_path is a complex API. See the Rust docs for complete information: https://docs.rs/bdk_wallet/latest/bdk_wallet/struct.TxBuilder.html#method.policy_path

• setExactSequence

   TxBuilder setExactSequence(UInt nsequence)

  Set an exact nSequence value.

  This can cause conflicts if the wallet’s descriptors contain an "older" (OP_CSV) operator and the given nsequence is lower than the CSV value.

• setRecipients

   TxBuilder setRecipients(List<ScriptAmount> recipients)

  Replace the recipients already added with a new list of recipients.

• unspendable

   TxBuilder unspendable(List<OutPoint> unspendable)

  Replace the internal list of unspendable utxos with a new list.

  It’s important to note that the "must-be-spent" utxos added with TxBuilder::add_utxo have priority over these.

• version

   TxBuilder version(Integer version)

  Build a transaction with a specific version.

  The version should always be greater than 0 and greater than 1 if the wallet’s descriptors contain an "older" (OP_CSV) operator.