Andrew Chow 710cab1d43 Merge bitcoin/bitcoin#26032: wallet: skip R-value signature grinding for external signers
807de2cebd wallet: skip R-value grinding for external signers (Sjors Provoost)
72b763e452 wallet: annotate bools in descriptor SPKM FillPSBT() (Sjors Provoost)

Pull request description:

  When producing a dummy signature for the purpose of estimating the transaction fee, do not assume an external signer performs R-value grinding on the signature.

  In particular, this avoids a scenario where the fee rate is 1 sat / vbyte and a transaction with a 72 byte signature is not accepted into our mempool.

  Suggested testing:
  1. On master, launch with `-signet` and create an external signer wallet using e.g. a Trezor and HWI, see [guide](https://github.com/bitcoin/bitcoin/blob/master/doc/external-signer.md#example-usage) (with the GUI it should "just work" once you have the HWI path configured).
  2. Create a few addresses and fund them from the faucet: https://signet.bc-2.jp/ (wait for confirmation)
  3. Create another address, and now send the entire wallet to it, set the fee to 1 sat/byte
  4. Most likely this transaction never gets broadcast and you won't see it on the [signet explorer](https://explorer.bc-2.jp)

  5. With this PR, try again.
  6. Check the explorer and inspect the transaction. Each input witness starts with either `30440220` (R has 32 bytes) or `30440221` (R has 33 bytes). See this explainer for [DER encoding](https://bitcoin.stackexchange.com/questions/92680/what-are-the-der-signature-and-sec-format).

  Fixes #26030

ACKs for top commit:
  S3RK:
    ACK 807de2cebd
  achow101:
    ACK 807de2cebd
  furszy:
    ACK 807de2ce
  ishaanam:
    utACK 807de2cebd

Tree-SHA512: 64f626a3030ef0ab1e43af86d8fba113151512561baf425e6e5182af53df3a64fa9e85c7f67bf4ed15b5ad6e5d5afc7fbba8b6e1f3bad388e48db51cb9446074
2023-02-27 12:37:46 -05:00

Bitcoin Core integration/staging tree

https://bitcoincore.org

For an immediately usable, binary version of the Bitcoin Core software, see https://bitcoincore.org/en/download/.

What is Bitcoin Core?

Bitcoin Core connects to the Bitcoin peer-to-peer network to download and fully validate blocks and transactions. It also includes a wallet and graphical user interface, which can be optionally built.

Further information about Bitcoin Core is available in the doc folder.

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Bitcoin Core integration/staging tree
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