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Can you give a simple step-by-step example for a taproot transaction with bitcoin-cli on Testnet?

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1 Answer 1

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Steps that I followed to do a transaction which creates a P2TR output:

  1. Copy XPUB from test vectors mentioned in BIP 86
xpub6BgBgsespWvERF3LHQu6CnqdvfEvtMcQjYrcRzx53QJjSxarj2afYWcLteoGVky7D3UKDP9QyrLprQ3VCECoY49yfdDEHGCtMMj92pReUsQ
  1. Convert XPUB (mainnet) to TPUB (testnet) using Bitcoin Extended Public Key Converter
tpubDC3pD7UZXnsgh3EBjbtBQiB1FnLask7UHBSunZ1DPK4dCFFZoFRkgxHB8gt42FvLzx1DpxfHWxAsYaY6b643RVcGjDxXxns7wKKYnnfEcbB
  1. Create a blank descriptor wallet with private keys disabled:
bitcoin-cli -named createwallet wallet_name=taproot_wallet blank=true disable_private_keys=true descriptors=true
  1. Save the descriptor info in a text file for TPUB we got from step 2 (descriptor.txt):
[
  {
    "desc": "tr([8868ab13/86'/1'/0']tpubDC3pD7UZXnsgh3EBjbtBQiB1FnLask7UHBSunZ1DPK4dCFFZoFRkgxHB8gt42FvLzx1DpxfHWxAsYaY6b643RVcGjDxXxns7wKKYnnfEcbB/0/*)#06sjusfa",
    "timestamp": "now",
    "active": true,
    "internal": false,
    "range": [
      0,
      999
    ],
    "next": 0
  }
]

I have copied this format from listdescriptors output for a new descriptor wallet that had private keys enabled.

  1. Import this descriptor in wallet we created in step 3:
bitcoin-cli -rpcwallet=taproot_wallet importdescriptors "$(cat descriptor.txt)"
  1. This is a watch only wallet with a taproot descriptor TPUB that can be used to create new bech32m address:
bitcoin-cli -rpcwallet=taproot_wallet getnewaddress "" "bech32m"
tb1p5cyxnuxmeuwuvkwfem96lqzszd02n6xdcjrs20cac6yqjjwudpxqp3mvzv
  1. Send some bitcoin from another wallet:

https://blockstream.info/testnet/tx/2035ead4a9d0c8e2da1184924abc9034d26f2a7093371183ef12891623b235d1

I had compiled bitcoind with branch used by Sjors Provoost in PR #2260

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  • But how do you spend from that taproot output? I guess you have to do the same steps while using a privKey instead of a xPub, right?
    – RobinLinus
    Aug 11, 2021 at 14:19
  • Yes use XPRV for mainnet and TPRV for testnet. Test vectors in BIP 86 had no TPRV so I had to follow the steps mentioned in this answer.
    – user103136
    Aug 11, 2021 at 14:23

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