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Test watch-only LND wallet and signing PSBT #87

@notmandatory

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@notmandatory

This issue is to do a proof of concept test with BDK to confirm BDK can create a watch-only wallet to monitor the LND UTXOs and generate a PSBT that can be signed by LND. This idea is based on a discussion I had with @nicolasburtey and @bodymindarts about doing a BDK based wallet microservice for Galoy, initially for batching payments.

Goal of this test:

  • Setup regtest bitcoind with LND and BDK-CLI
  • Create LND on-chain wallet and load with test coins
  • Setup BDK-CLI wallet to watch LND on-chain wallet (xpub descriptor)
  • Create batch spending PSBT with BDK-CLI
  • Sign and spend BDK-CLI generated PSBT with LND on-chain wallet

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