Nunchuk Wallet Transactions

Nunchuk Wallet Transactions

If auth or network setup is the blocker, use nunchuk-setup.

If the user wants to lock coins or manage coin tags and collections, use nunchuk-coin-control.

Default workflow

Progress:

• Preview with tx draft (optional, when the user wants to check fee or inputs first)
• Create the transaction
• Sign the transaction
• Broadcast the transaction

If the user explicitly asks for only preview, only sign, only broadcast, or only inspect, do only that step.

Preview

tx draft builds the same transaction tx create would (same coin selection, same fee) but never creates, uploads, or stores anything. It accepts the same options as tx create, plus --fiat <code>:

nunchuk tx draft --wallet <wallet-id> --to <address> --amount 100000
nunchuk tx draft --wallet <wallet-id> --to <address> --send-all
nunchuk tx draft --wallet <wallet-id> --to <address> --amount 100000 --fiat USD

The draft shows the fee rate, estimated fee, total amount, change output, and the input coins that would be spent.

Create

Create a transaction:

nunchuk tx create --wallet <wallet-id> --to <address> --amount <satoshis>

Send the entire wallet balance (no change; the recipient receives balance minus fee):

nunchuk tx create --wallet <wallet-id> --to <address> --send-all

Make the recipient pay the fee (receives amount - fee):

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --subtract-fee

Pin nLockTime to the current block height (anti-fee sniping):

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --anti-fee-sniping

Fees

tx create auto-estimates the fee rate. Override it per transaction:

# Manual fee rate in sat/vB (fractional accepted)
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --fee-rate 1.5

# Pick the estimate level for this transaction
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --fee-level priority

Show the current recommended rates for the three levels (priority, standard, economy):

nunchuk tx fees

Save a default fee level for the account (used when neither --fee-rate nor --fee-level is given):

nunchuk config fee-rate set priority
nunchuk config fee-rate get
nunchuk config fee-rate reset

Precedence: --fee-rate > --fee-level > saved account default > built-in economy.

Choose Coins

Spend exactly specific coins (manual selection, no automatic top-up):

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --coin <txid>:<vout> --coin <txid>:<vout>

Sweep only specific coins:

nunchuk tx create --wallet <wallet-id> --to <address> --send-all --coin <txid>:<vout>

Restrict automatic selection to coins carrying a tag, coins in a collection, or both (intersection):

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --from-tag kyc
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --from-collection "Exchange A"
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --from-tag kyc --from-collection "Exchange A"

Control which tags the change coin inherits (default: all tags of the input coins):

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --change-tags none
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --change-tags kyc,cold

Find coin outpoints, lock coins, and manage tags with nunchuk-coin-control (coin list, coin lock, coin tag).

What Miniscript Signing Path Means

A Miniscript wallet can have multiple valid spending branches.

The active signing path determines:

• which signers are required
• whether a locktime is required
• whether a sequence value is required
• whether one or more hash preimages are required

Use nunchuk miniscript inspect to view the possible policy paths before spending, or when reviewing a template before wallet creation:

nunchuk miniscript inspect --wallet <wallet-id>
nunchuk miniscript inspect --descriptor "wsh(...)"
nunchuk miniscript inspect --miniscript "multi(2,key_0_0,key_1_0,key_2_0)"
nunchuk miniscript inspect --miniscript "multi_a(2,key_0_0,key_1_0,key_2_0)" --address-type TAPROOT
nunchuk miniscript inspect --miniscript "or_d(multi(2,key_0_0,key_1_0,key_2_0),and_v(v:pk(key_3_0),after(1735689600)))"

Use --locktime and --sequence when you need to know which path is currently satisfiable:

nunchuk miniscript inspect --wallet <wallet-id> --locktime 1735689600 --sequence 144

Use nunchuk tx get to inspect the live transaction-selected path:

nunchuk tx get --wallet <wallet-id> --tx-id <tx-id>

tx get can show:

• Required signers
• Locktime
• Sequence
• Hash preimages
• Path signers

READY_TO_BROADCAST depends on the selected Miniscript path being fully satisfied, not on wallet m-of-n alone.

For Miniscript, choose a specific path if needed:

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --miniscript-path 0

For Taproot wallets, key-path spend is the default when available. Force script-path spend when needed:

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --taproot-script-path
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --taproot-script-path --miniscript-path 0

For Miniscript, attach required preimages when the selected path needs them:

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --preimage <32-byte-hex>

Sign

Sign with all matching stored keys:

nunchuk tx sign --wallet <wallet-id> --tx-id <tx-id>

Sign with a specific stored key:

nunchuk tx sign --wallet <wallet-id> --tx-id <tx-id> --fingerprint <xfp>

Attach Miniscript preimages while signing:

nunchuk tx sign --wallet <wallet-id> --tx-id <tx-id> --preimage <32-byte-hex>

Merge an externally signed PSBT:

nunchuk tx sign --wallet <wallet-id> --tx-id <tx-id> --psbt <signed-psbt-base64>

Inspect

List transactions:

nunchuk tx list --wallet <wallet-id>

Get one transaction:

nunchuk tx get --wallet <wallet-id> --tx-id <tx-id>

Broadcast

Broadcast a fully signed transaction:

nunchuk tx broadcast --wallet <wallet-id> --tx-id <tx-id>

Common requests

User asks: send 100 USD to an address:

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100 --currency USD

User asks: send 250 USD to an address, then sign and broadcast:

nunchuk tx create --wallet <wallet-id> --to <address> --amount 250 --currency USD
nunchuk tx sign --wallet <wallet-id> --tx-id <tx-id>
nunchuk tx broadcast --wallet <wallet-id> --tx-id <tx-id>

User asks: send everything in the wallet:

nunchuk tx create --wallet <wallet-id> --to <address> --send-all

User asks: check the fee before sending:

# Preview, then create with the same locked-in rate.
nunchuk tx draft --wallet <wallet-id> --to <address> --amount 100000
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --fee-rate <previewed-rate>

User asks: send with the fastest confirmation:

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --fee-level priority

User asks: spend only KYC coins:

nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --from-tag kyc

User asks: spend a specific coin:

# Get outpoints from coin list first (see nunchuk-coin-control).
nunchuk coin list --wallet <wallet-id>
nunchuk tx create --wallet <wallet-id> --to <address> --amount 100000 --coin <txid>:<vout>

User asks: sign with a hardware wallet or external signer:

# Get the current pending PSBT.
nunchuk tx get --wallet <wallet-id> --tx-id <tx-id> --json

# Sign that PSBT externally, then merge it back.
nunchuk tx sign --wallet <wallet-id> --tx-id <tx-id> --psbt <signed-psbt-base64>

Defaults

• tx create treats --amount as satoshis by default.
• Use --currency for fiat or BTC amounts.
• tx create estimates the fee rate automatically; precedence when overriding is --fee-rate > --fee-level > saved account default > economy.
• Automatic coin selection skips locked coins; when the transaction produces change, the change coin inherits the input coins' tags unless --change-tags overrides it.
• tx draft never creates, uploads, or stores anything — safe to run any time.
• For Taproot wallets, tx create uses key-path signing by default when available.
• If no key option is provided, tx sign auto-detects matching stored keys for the wallet and signs with all of them.
• Use tx get --json to retrieve the current pending PSBT before signing externally.
• Use --json when the user needs exact machine-readable output.

Gotchas

• --coin is repeatable and spends exactly the listed coins — no subset optimization, no automatic top-up; a shortfall fails with insufficient funds.
• --coin spends a coin even if it is locked; locks only guard automatic selection.
• --coin cannot be combined with --from-tag or --from-collection.
• --from-tag and --from-collection given together intersect: only coins matching both qualify.
• --send-all implies --subtract-fee and ignores --amount (with a warning).
• --subtract-fee is rejected when the amount cannot cover the fee or the reduced output would be dust.
• --change-tags must be none or a subset of the tags on the input coins — it copies existing classification, it never invents tags.
• A draft's auto-estimated fee rate can change before tx create runs — pass --fee-rate to lock the previewed rate.
• tx sign skips keys that already signed the PSBT.
• tx sign --psbt cannot be used with --xprv or --fingerprint.
• --preimage <32-byte-hex> is required when the chosen Miniscript branch includes hash locks.
• --miniscript-path <index> is for choosing a specific branch when the user does not want the default satisfiable path selection.
• Use --taproot-script-path when the user wants to spend a Taproot wallet through a script path instead of the default key path.
• tx broadcast requires a fully signed transaction, status is READY_TO_BROADCAST.