Manually PSBT Signing

[GregorWedlich]

Unfortunately, there is still no wallet that supports manual signing of PSBTs. This would be helpful, for example, for the official Ord wallet (https://github.com/ordinals/ord), where inscriptions are often on a separate address, making sending them unwieldy and expensive.

1. Create a Seller PSBT (ID, Owner, UTXO, Price, etc.) https://sado.space/docs/sdk-instantbuy#create-seller-psbt 1.1. Example: Sign with "bitcoin-cli walletprocesspsbt"..." true "SINGLE|ANYONECANPAY" on the machine with the Ord Wallet.
2. Verify the Buyer has UTXOs in their wallet, or create two DUMMY UTXOs. 2.1. Create Buyer PSBT and Sign with Unisat, Xverse, etc.

But maybe the request is wrong at this point :)

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