Subject: Re: [bitcoin-dev] New Silent Payment version

From: Ali Sherief <[email-masked]>
Date: Mon, 22 Aug 2022 12:55:58 +0000

Besides, all silent payments are mined at the end of the day, so they are still transactions that are included in publicly auditable blocks.

The only thing that changes from the user's point of view is that these addresses cannot be heirarchically derived with BIP44 (or any other path for that matter). Nobody else can find out the HD paths of an address anyway.

- Ali

On Sun, 21 Aug 2022 22:01:34 +0000, [email-masked] wrote:
> The current Silent Payment implementation uses the standard Taproot script (Segwit V1).
>
> This does not in any way affect the consensus or auditability rules.
>
>
>
>
> Sent with Proton Mail secure email.
>
> ------- Original Message -------
> On Wednesday, August 17th, 2022 at 11:21 PM, <[email-masked]> wrote:
>
>
> > Let's be clear, if Bitcoin allows secret payments that cannot be
> > publicly audited then they have exceeded the original consensus that
> > gave Bitcoin fungibility and I will be publicly disavowing Bitcoin and
> > advocating for a full sell down. Why don't you resurrect Monero. -DA.
> >
> > On 2022-08-17 10:08, woltx via bitcoin-dev wrote:
> >
> > > PR #24897 (https://github.com/bitcoin/bitcoin/pull/24897) has been
> > > updated with a new silent payment version, which eliminates some
> > > manual steps from the previous version (such as the need to set the
> > > `keypool` to avoid costly multi-key scan).
> > >
> > > This is achieved by using a new descriptor type ("sp()") that has no
> > > range and contains exactly one key.
> > >
> > > Example: "sp(cQq73sG9....JD51uaRD)#9llg6xjm"
> > >
> > > This descriptor introduces a new type of output: "silent-payment".
> > > This output type returns a standard Taproot script (Segwit V1), but
> > > with HRP changed from "bc" to "sp" on the mainnet (or "tsp" on
> > > testnet and signet).
> > >
> > > This output type will always generate the same address (unless another
> > > "sp" descriptor is enabled on the same wallet).
> > >
> > > $ ./src/bitcoin-cli -signet getnewaddress '' 'silent-payment'
> > > tsp1pfmjyl7ecpmx8yf8cu6g3ez36jy7s9mzuh5pdnal3k0n588uzgmfs4s4fws
> > >
> > > To create a silent transaction, simply use the silent payment address
> > > as one of the outputs.
> > >
> > > The "send" RPC will automatically identify and tweak it.
> > >
> > > The transaction can contain multiple outputs, combining silent and
> > > standard addresses.
> > >
> > > I have written a step by step signet tutorial so reviewers can test
> > > this new version easily.
> > >
> > > https://gist.github.com/w0xlt/a7b498ac1ff14b8c292a22be789bd93f