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crateix!;
/**
| Combines PSBTs with the same underlying
| transaction, resulting in a single
| PSBT with all partial signatures from
| each input.
|
| -----------
| @param[out] out
|
| the combined PSBT, if successful
| ----------
| @param[in] psbtxs
|
| the PSBTs to combine
|
| -----------
| @return
|
| error (OK if we successfully combined
| the transactions, other error if they
| were not compatible)
|
*/