lightning-utxopsbt -- Command to populate PSBT inputs from given UTXOs
SYNOPSIS
utxopsbt satoshi feerate startweight utxos [reserve] [reservedok] [locktime] [min_witness_weight] [excess_as_change] [opening_anchor_channel]
DESCRIPTION
utxopsbt is a low-level RPC command which creates a PSBT using unreserved inputs in the wallet, optionally reserving them as well.
It deliberately mirrors the parameters and output of lightning-fundpsbt(7) except instead of an optional minconf parameter to select unreserved outputs from the wallet, it takes a compulsory list of outputs to use.
- satoshi (sat_or_all): The minimum satoshi value of the output(s) needed (or the string
all
meaning use all unreserved inputs). If a value, it can be a whole number, a whole number ending in sat, a whole number ending in 000msat, or a number with 1 to 8 decimal places ending in btc. - feerate (feerate): Used for the transaction as initial feerate. The default is normal.
- startweight (u32): The weight of the transaction before fundpsbt has added any inputs.
- utxos (array of outpoints): An array of
txid:vout
, each of which must be reserved or available.:- (outpoint, optional)
- reserve (u32, optional): If not zero, then reserveinputs is called (successfully, with exclusive true) on the returned PSBT for this number of blocks. The default is 72 blocks.
- reservedok (boolean, optional): If set to true, it will also fail if any of the utxos are already reserved. The default is false.
- locktime (u32, optional): If not set, it is set to a recent block height.
- min_witness_weight (u32, optional): Minimum weight to use for a UTXO's witness. If the actual witness weight is greater than the provided minimum, the actual witness weight will be used.
- excess_as_change (boolean, optional): Flag to add a change output for the excess sats.
- opening_anchor_channel (boolean, optional): To signel that it needs emergency reserve for anchors so that we can lowball our commitment tx fees, and min-emergency-msat for reserving some sats for closing anchor channels. (added v23.08)
RETURN VALUE
On success, an object is returned, containing:
- psbt (string): Unsigned PSBT which fulfills the parameters given.
- feerate_per_kw (u32): The feerate used to create the PSBT, in satoshis-per-kiloweight.
- estimated_final_weight (u32): The estimated weight of the transaction once fully signed.
- excess_msat (msat): The amount above satoshi which is available. This could be zero, or dust; it will be zero if change_outnum is also returned.
- change_outnum (u32, optional): The 0-based output number where change was placed (only if parameter excess_as_change was true and there was sufficient funds).
- reservations (array of objects, optional): If reserve was true or a non-zero number, just as per lightning- reserveinputs(7).:
- txid (txid): The txid of the transaction.
- vout (u32): The 0-based output number.
- was_reserved (boolean): Whether this output was previously reserved.
- reserved (boolean) (always true): Whether this output is now reserved.
- reserved_to_block (u32): The blockheight the reservation will expire.
On success, returns the psbt it created, containing the inputs, feerate_per_kw showing the exact numeric feerate it used, estimated_final_weight for the estimated weight of the transaction once fully signed, and excess_msat containing the amount above satoshi which is available. This could be zero, or dust. If satoshi was all
, then excess_msat is the entire amount once fees are subtracted for the weights of the inputs and startweight.
If reserve was true or a non-zero number, then a reservations array is returned, exactly like reserveinputs.
If excess_as_change is true and the excess is enough to cover an additional output above the dust_limit
, then an output is added to the PSBT for the excess amount. The excess_msat will be zero. A change_outnum will be returned with the index of the change output.
ERRORS
On error the returned object will contain code
and message
properties, with code
being one of the following:
- -32602: If the given parameters are wrong.
- -1: Catchall nonspecific error.
- 301: Insufficient UTXOs to meet satoshi value.
AUTHOR
Rusty Russell <[email protected]> is mainly responsible.
SEE ALSO
lightning-fundpsbt(7)
RESOURCES
Main web site: https://github.com/ElementsProject/lightning
EXAMPLES
Example 1:
Request:
lightning-cli utxopsbt -k "satoshi"=0 "feerate"="253perkw" "startweight"=0 "utxos"='["d82a99192fb333106ea8d08f5231ed45f2ed5b1ef9eb81b0fef8f9ea354d2637:1"]' "reserve"=0 "reservedok"=True "excess_as_change"=False
{
"id": "example:utxopsbt#1",
"method": "utxopsbt",
"params": {
"satoshi": 0,
"feerate": "253perkw",
"startweight": 0,
"utxos": [
"d82a99192fb333106ea8d08f5231ed45f2ed5b1ef9eb81b0fef8f9ea354d2637:1"
],
"reserve": 0,
"reservedok": true,
"excess_as_change": false
}
}
Response:
{
"psbt": "cHNidP8BADMCAAAAATcmTTXq+fj+sIHr+R5b7fJF7TFSj9CobhAzsy8ZmSrYAQAAAAD9////AGYAAAAAAQDeAgAAAAABAWQACJva49ga8OCYXvPRWQRhoXndrJykwjgXbwT251dEAAAAAAD9////AiOI9ikBAAAAFgAU3gClv/YpAKRpfDuiFu6mIL2E4+5QaQ8AAAAAABYAFAH62Qq81maX4lkhZHIt5KlevuFlAkcwRAIgUXIQFs7oRkorVThUn3sLj7WI7g8c8RHai4ChoCvIkWsCICp1CqHl4BlMJCKFHRWHXhhekaj0r1EFSNrh8UnvysQPASEDqHIAEdaH3H6pb3VJzbJNDG4lL8PTfsheL+h2p6baK3JlAAAAAQEfUGkPAAAAAAAWABQB+tkKvNZml+JZIWRyLeSpXr7hZQA=",
"feerate_per_kw": 253,
"estimated_final_weight": 271,
"excess_msat": 1009932000
}
Example 2:
Request:
lightning-cli utxopsbt -k "satoshi"=1000000 "feerate"="7500perkw" "startweight"=0 "utxos"='["2fc3b9f8d4aed120f6d9a6f206f07c35ef4d518ec0305d1d974873d256e38ca7:1", "2f669f6a605ee5c7ddd2abb753bc64b1a90bd1b7448264f5d78a7ca823c00a1b:1"]' "reservedok"=True "excess_as_change"=False
{
"id": "example:utxopsbt#2",
"method": "utxopsbt",
"params": {
"satoshi": 1000000,
"feerate": "7500perkw",
"startweight": 0,
"utxos": [
"2fc3b9f8d4aed120f6d9a6f206f07c35ef4d518ec0305d1d974873d256e38ca7:1",
"2f669f6a605ee5c7ddd2abb753bc64b1a90bd1b7448264f5d78a7ca823c00a1b:1"
],
"reservedok": true,
"excess_as_change": false
}
}
Response:
{
"psbt": "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",
"feerate_per_kw": 7500,
"estimated_final_weight": 542,
"excess_msat": 995935000,
"reservations": [
{
"txid": "2fc3b9f8d4aed120f6d9a6f206f07c35ef4d518ec0305d1d974873d256e38ca7",
"vout": 1,
"was_reserved": true,
"reserved": true,
"reserved_to_block": 246
},
{
"txid": "2f669f6a605ee5c7ddd2abb753bc64b1a90bd1b7448264f5d78a7ca823c00a1b",
"vout": 1,
"was_reserved": true,
"reserved": true,
"reserved_to_block": 246
}
]
}