Perhaps instead of a flag that can be used to disable a specific operation,
there should be a "-ignoredflags=x,y,z" section of the URI that can be used
to ignore whatever BIP this might also be useful for in the future?

On Dec 5, 2017 11:34 AM, "Sjors Provoost via bitcoin-dev" <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> One way to reduce fees is to encourage usage of Replace-By-Fee, BIP 125
> [0]. It allows wallets to recommend lower fees, because if a transaction
> gets stuck due to underestimation, the fee can easily be bumped.
>
> Bitcoin Core has had support for RBF for a while, and as of v0.15.0
> recommends lower fees [1] when the user chooses to use RBF.
>
> I recently submitted a pull request that would turn on RBF by default,
> which triggered some discussion [2]. To ease the transition for merchants
> who are reluctant to see their customers use RBF, Matt Corallo suggested
> that wallets honor a no125=1 flag.
>
> So a BIP-21 URI would look like this: bitcoin:175t...45W?amount=20.
> 3&no125=1
>
> When this flag is set, wallets should not use RBF, regardless of their
> default, unless the user explicitly overrides the merchant's preference.
>
> Afaik adding this flag won't break existing BIP-21 support. It doesn't use
> the req- prefix, because it's optional. I'm also not aware of any ad hoc
> standards that use no125 in BIP-21-ish URIs.
>
> - Sjors
>
> P.S. I'd similarly suggest adding a bech32 param, but that's for another
> discussion
>
> [0] https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki
> [1] https://bitcoincore.org/en/2017/09/01/release-0.15.0/#
> better-fee-estimates
> [2] https://github.com/bitcoin/bitcoin/pull/11605
> [3] https://github.com/bitcoin/bitcoin/issues/11828
>
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