mirror of
https://github.com/ElementsProject/lightning.git
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252 lines
8.7 KiB
JSON
252 lines
8.7 KiB
JSON
{
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"$schema": "../rpc-schema-draft.json",
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"type": "object",
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"additionalProperties": false,
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"rpc": "fundpsbt",
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"title": "Command to populate PSBT inputs from the wallet",
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"description": [
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"`fundpsbt` is a low-level RPC command which creates a PSBT using unreserved inputs in the wallet, optionally reserving them as well."
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],
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"request": {
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"required": [
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"satoshi",
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"feerate",
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"startweight"
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],
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"properties": {
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"satoshi": {
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"type": "sat_or_all",
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"description": [
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"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*."
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]
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},
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"feerate": {
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"type": "feerate",
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"description": [
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"Used for the transaction as initial feerate."
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],
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"default": "*normal*"
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},
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"startweight": {
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"type": "u32",
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"description": [
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"The weight of the transaction before *fundpsbt* has added any inputs."
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]
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},
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"minconf": {
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"type": "u32",
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"description": [
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"The minimum number of confirmations that used outputs should have."
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],
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"default": "1"
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},
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"reserve": {
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"type": "u32",
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"description": [
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"If not zero, then *reserveinputs* is called (successfully, with *exclusive* true) on the returned PSBT for this number of blocks."
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],
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"default": "72 blocks"
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},
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"locktime": {
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"type": "u32",
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"description": [
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"The locktime of the transaction. if not set, it is set to a recent block height."
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]
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},
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"min_witness_weight": {
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"type": "u32",
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"description": [
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"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."
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]
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},
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"excess_as_change": {
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"type": "boolean",
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"description": [
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"Flag to add a change output for the excess sats."
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]
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},
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"nonwrapped": {
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"added": "v23.02",
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"type": "boolean",
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"description": [
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"To signal to filter out any p2sh-wrapped inputs from funding this PSBT."
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]
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},
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"opening_anchor_channel": {
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"added": "v23.08",
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"type": "boolean",
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"description": [
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"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."
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]
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}
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}
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},
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"response": {
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"required": [
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"psbt",
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"feerate_per_kw",
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"estimated_final_weight",
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"excess_msat"
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],
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"properties": {
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"psbt": {
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"type": "string",
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"description": [
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"Unsigned PSBT which fulfills the parameters given."
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]
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},
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"feerate_per_kw": {
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"type": "u32",
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"description": [
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"The feerate used to create the PSBT, in satoshis-per-kiloweight."
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]
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},
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"estimated_final_weight": {
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"type": "u32",
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"description": [
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"The estimated weight of the transaction once fully signed."
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]
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},
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"excess_msat": {
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"type": "msat",
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"description": [
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"The amount above *satoshi* which is available. This could be zero, or dust; it will be zero if *change_outnum* is also returned."
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]
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},
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"change_outnum": {
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"type": "u32",
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"description": [
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"The 0-based output number where change was placed (only if parameter *excess_as_change* was true and there was sufficient funds)."
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]
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},
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"reservations": {
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"type": "array",
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"description": [
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"If *reserve* was true or a non-zero number, just as per lightning- reserveinputs(7)."
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],
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"items": {
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"type": "object",
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"required": [
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"txid",
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"vout",
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"was_reserved",
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"reserved",
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"reserved_to_block"
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],
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"additionalProperties": false,
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"properties": {
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"txid": {
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"type": "txid",
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"description": [
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"The txid of the transaction."
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]
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},
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"vout": {
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"type": "u32",
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"description": [
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"The 0-based output number."
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]
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},
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"was_reserved": {
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"type": "boolean",
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"enum": [
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false
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],
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"description": [
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"Whether this output was previously reserved."
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]
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},
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"reserved": {
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"type": "boolean",
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"enum": [
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true
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],
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"description": [
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"Whether this output is now reserved."
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]
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},
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"reserved_to_block": {
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"type": "u32",
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"description": [
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"The blockheight the reservation will expire."
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]
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}
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}
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}
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}
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},
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"post_return_value_notes": [
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"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."
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]
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},
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"usage": [
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"Let's assume the caller is trying to produce a 100,000 satoshi output.",
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"",
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"First, the caller estimates the weight of the core (typically 42) and known outputs of the transaction (typically (9 + scriptlen) * 4). For a simple P2WPKH it's a 22 byte scriptpubkey, so that's 124 weight.",
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"",
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"It calls \"*fundpsbt* 100000sat slow 166\", which succeeds, and returns the *psbt* and *feerate_per_kw* it used, the *estimated_final_weight* and any *excess_msat*.",
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"",
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"If *excess_msat* is greater than the cost of adding a change output, the caller adds a change output randomly to position 0 or 1 in the PSBT. Say *feerate_per_kw* is 253, and the change output is a P2WPKH (weight 124), the cost is around 31 sats. With the dust limit disallowing payments below 546 satoshis, we would only create a change output if *excess_msat* was greater or equal to 31 + 546."
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],
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"errors": [
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"On error the returned object will contain `code` and `message` properties, with `code` being one of the following:",
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"",
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"- -32602: If the given parameters are wrong.",
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"- -1: Catchall nonspecific error.",
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"- 301: Insufficient UTXOs to meet *satoshi* value."
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],
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"author": [
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"Rusty Russell <<rusty@rustcorp.com.au>> is mainly responsible."
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],
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"see_also": [
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"lightning-utxopsbt(7)",
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"lightning-reserveinputs(7)",
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"lightning-unreserveinputs(7)"
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],
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"resources": [
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"Main web site: <https://github.com/ElementsProject/lightning>"
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],
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"examples": [
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{
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"request": {
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"id": "example:fundpsbt#1",
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"method": "fundpsbt",
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"params": {
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"satoshi": 1000000,
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"feerate": "253perkw",
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"startweight": 250,
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"reserve": 0
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}
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},
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"response": {
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"psbt": "cHNidP8BAF4CAAAAAZiQf/mEs4NcFFfD4K8xauOgSpbz/xeetoXVWAPCI0h6AQAAAAD9////AahhAAAAAAAAIlEg+3d9jpNmK0getyg5W+Mp31CPIRDKcJg/mZs/uaVrQ+GZAAAAAAEAiQIAAAABswU80whDZOoIHS/lfyxwmHh5USHBwbcjWHaJ9/XU+78BAAAAAP3///8CgIQeAAAAAAAiACDJvFwGPK7796bHgUQHtWJ7T4GotW7L6TLGgvnLrA0Z32INzQsAAAAAIlEgyRg+3pEh88b9FJiCLEenYCcyJ2ackJUIhDusW72BP2iYAAAAAQErYg3NCwAAAAAiUSDJGD7ekSHzxv0UmIIsR6dgJzInZpyQlQiEO6xbvYE/aAAA",
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"feerate_per_kw": 253,
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"estimated_final_weight": 693,
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"excess_msat": 196962507000,
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"change_outnum": 0
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}
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},
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{
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"request": {
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"id": "example:fundpsbt#2",
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"method": "fundpsbt",
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"params": {
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"satoshi": 500000,
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"feerate": "urgent",
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"startweight": 166,
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"reserve": 0,
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"excess_as_change": true,
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"min_witness_weight": 110
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}
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},
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"response": {
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"psbt": "cHNidP8BAF4CAAAAAZiQf/mEs4NcFFfD4K8xauOgSpbz/xeetoXVWAPCI0h6AQAAAAD9////AfZRxQsAAAAAIlEg21kTTo7K2doCG6F2JqgaDjc1kRCrH7AL08oPVVJhuE+ZAAAAAAEAiQIAAAABswU80whDZOoIHS/lfyxwmHh5USHBwbcjWHaJ9/XU+78BAAAAAP3///8CgIQeAAAAAAAiACDJvFwGPK7796bHgUQHtWJ7T4GotW7L6TLGgvnLrA0Z32INzQsAAAAAIlEgyRg+3pEh88b9FJiCLEenYCcyJ2ackJUIhDusW72BP2iYAAAAAQErYg3NCwAAAAAiUSDJGD7ekSHzxv0UmIIsR6dgJzInZpyQlQiEO6xbvYE/aAAA",
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"feerate_per_kw": 11000,
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"estimated_final_weight": 612,
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"excess_msat": 0,
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"change_outnum": 0
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}
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}
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]
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}
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