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lightning/doc/lightning-utxopsbt.7

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utxopsbt: new command to create PSBT from given utxos. It's *possible* to do this using various RPC calls, but it's unfriendly: 1. Call getinfo to get the current block height. 2. Call listfunds to map the UTXOs. 3. Create the PSBT and hope you get all the fields correct. Instead, this presents an interface just like `fundpsbt`, with identical returns. I think it's different enough to justify a new command (though it shares much internally, of course). In particular, it's now quite simple to create a command which uses specified utxos, and then adds more to meet any shortfall. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
4 years ago
.TH "LIGHTNING-UTXOPSBT" "7" "" "" "lightning-utxopsbt"
.SH NAME
lightning-utxopsbt - Command to populate PSBT inputs from given UTXOs
.SH SYNOPSIS
fundpsbt/utxopsbt: new `min_witness_weight` param Needed for v2 of channel opens, where the minimum weight is 110; a 'simple utxo' (sig + key) weighs in at 107, so we a need a way to establish a floor for this case. Changelog-Added: JSON-RPC: fundpsbt/utxopsbt have new param, `min_witness_utxo`, which sets a floor for the weight calculation of an added input
4 years ago
\fButxopsbt\fR \fIsatoshi\fR \fIfeerate\fR \fIstartweight\fR \fIutxos\fR [\fIreserve\fR] [\fIreservedok\fR] [\fIlocktime\fR] [\fImin_witness_weight\fR]
utxopsbt: new command to create PSBT from given utxos. It's *possible* to do this using various RPC calls, but it's unfriendly: 1. Call getinfo to get the current block height. 2. Call listfunds to map the UTXOs. 3. Create the PSBT and hope you get all the fields correct. Instead, this presents an interface just like `fundpsbt`, with identical returns. I think it's different enough to justify a new command (though it shares much internally, of course). In particular, it's now quite simple to create a command which uses specified utxos, and then adds more to meet any shortfall. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
4 years ago
.SH DESCRIPTION
\fIutxopsbt\fR 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
\fBlightning-fundpsbt\fR(7) except instead of an optional \fIminconf\fR
parameter to select unreserved outputs from the wallet, it takes a
compulsory list of outputs to use\.
\fIutxos\fR must be an array of "txid:vout", each of which must be
reserved or available: the total amount must be sufficient to pay for
the resulting transaction plus \fIstartweight\fR at the given \fIfeerate\fR,
with at least \fIsatoshi\fR left over (unless \fIsatoshi\fR is \fBall\fR, which
is equivalent to setting it to zero)\.
utxopsbt: make default to only allow unreserved utxos. This more closely mirrors fundpsbt (which will only select unreserved ones) but you can turn it off if you want to e.g. rbf in future. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Changelog-Added: JSON-RPC: New low-level command `utxopsbt` to create PSBT from existing utxos.
4 years ago
Unless \fIreservedok\fR is set to true (default is false) it will also fail
if any of the \fIutxos\fR are already reserved\.
utxopsbt: let caller specify locktime, add tests and python binding. Changelog-Added: JSON-RPC: `utxopsbt` takes a new `locktime` parameter Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
4 years ago
\fIlocktime\fR is an optional locktime: if not set, it is set to a recent
block height\.
fundpsbt/utxopsbt: new `min_witness_weight` param Needed for v2 of channel opens, where the minimum weight is 110; a 'simple utxo' (sig + key) weighs in at 107, so we a need a way to establish a floor for this case. Changelog-Added: JSON-RPC: fundpsbt/utxopsbt have new param, `min_witness_utxo`, which sets a floor for the weight calculation of an added input
4 years ago
\fImin_witness_weight\fR is an 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\.
utxopsbt: new command to create PSBT from given utxos. It's *possible* to do this using various RPC calls, but it's unfriendly: 1. Call getinfo to get the current block height. 2. Call listfunds to map the UTXOs. 3. Create the PSBT and hope you get all the fields correct. Instead, this presents an interface just like `fundpsbt`, with identical returns. I think it's different enough to justify a new command (though it shares much internally, of course). In particular, it's now quite simple to create a command which uses specified utxos, and then adds more to meet any shortfall. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
4 years ago
.SH RETURN VALUE
On success, returns the \fIpsbt\fR containing the inputs, \fIfeerate_per_kw\fR
showing the exact numeric feerate it used, \fIestimated_final_weight\fR for
the estimated weight of the transaction once fully signed, and
\fIexcess_msat\fR containing the amount above \fIsatoshi\fR which is
available\. This could be zero, or dust\. If \fIsatoshi\fR was "all",
then \fIexcess_msat\fR is the entire amount once fees are subtracted
for the weights of the inputs and \fIstartweight\fR\.
If \fIreserve\fR was true, then a \fIreservations\fR array is returned,
exactly like \fIreserveinputs\fR\.
On error the returned object will contain \fBcode\fR and \fBmessage\fR properties,
with \fBcode\fR being one of the following:
.RS
.IP \[bu]
-32602: If the given parameters are wrong\.
.IP \[bu]
-1: Catchall nonspecific error\.
.IP \[bu]
301: Insufficient UTXOs to meet \fIsatoshi\fR value\.
.RE
.SH AUTHOR
Rusty Russell \fI<rusty@rustcorp.com.au\fR> is mainly responsible\.
.SH SEE ALSO
\fBlightning-fundpsbt\fR(7)\.
.SH RESOURCES
Main web site: \fIhttps://github.com/ElementsProject/lightning\fR
fundpsbt/utxopsbt: new `min_witness_weight` param Needed for v2 of channel opens, where the minimum weight is 110; a &#39;simple utxo&#39; (sig + key) weighs in at 107, so we a need a way to establish a floor for this case. Changelog-Added: JSON-RPC: fundpsbt/utxopsbt have new param, `min_witness_utxo`, which sets a floor for the weight calculation of an added input
4 years ago
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