Prepare PSBT

[motorina0]

Requirement

• prepare a PSBT for the user to sign
• the user provides the following:
  • xPub/zPub
  • destinationAddress
  • amount
  • fee (optional, can use 3rd party service)
  • changeAddress (optional, can be derived from xPub)

Steps

Open Topics

• how to select the best UTXOs to be used?
  1. allow the user to select
  2. select closes sum
  3. ...

[motorina0]

Resources

• derive key: bitcoinjs-lib/bip32
• build address: bitcoinjs-lib/payments
• utxo search: GET /api/address/:address/utxo https://mempool.space/api/address/
• coinselect: bitcoinjs-lib/coinselect
• create PSBT bitcoinjs-lib/psbt