PSBT Not Signing via HWI – `0x5515` Error from `bitcoininsotype.signpsbt:4`

I'm trying to sign a valid PSBT using HWI with a hardware wallet (Ledger), but I'm getting an error during signing:

HWIError: 0x5515 error in bitcoininsotype.signpsbt:4

🔧 Setup:

  • Network: regtest

  • Hardware wallet: Ledger Nano S Plus

  • Descriptor used (watch-only wallet imported to Bitcoin Core):

    tr([<fingerprint>/86h/1h/0h]tpub.../0/*)

  • UTXO:

    {
  "desc": "tr([fingerprint/86h/1h/0h/0/0]pubkey)#checksum",
  "amount": 1.0,
  ...
}

  • PSBT creation (using bitcoin-cli):

    bitcoin-cli -regtest -rpcwallet=tapwatch walletcreatefundedpsbt \
"[{ \"txid\": \"...\", \"vout\": 0 }]" \
"[{ \"bcrt1...\": 0.00099 }]" \
0 '{ "includeWatching": true, "replaceable": false, "subtractFeeFromOutputs": [0] }'

  • Signing command:

    hwi --device-type ledger --fingerprint <FPR> signpsbt <base64_psbt>

❌ Problem:

HWI throws this error:

0x5515 error in bitcoininsotype.signpsbt:4

  • PSBT inputs are Taproot (Bech32m).

  • Wallet was created via:

    createwallet "tapwatch" true true "" true

  • Descriptor imported using importdescriptors.

✅ Tried:

  • Verified descriptor and derivation paths.
  • Funded address matches the descriptor.
  • Ledger is on latest firmware.
  • Ledger Live is not running (to avoid interference).
  • Attempted multiple derivation paths: m/86h/1h/0h/0/0 and m/86h/1h/0h/0/1.

🧠 Questions:

  1. What does the 0x5515 error code indicate?
  2. Is it possible that HWI/Bitcoin Core is producing an invalid or incomplete PSBT for Ledger?
  3. Are there specific limitations with Ledger regarding Taproot + HWI signing (e.g., script type, derivation path)?
  4. How can I fix or debug this issue?

Any insight into what this error means or how to resolve it would be appreciated.



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