[Bitcoin-development] DarkWallet Best Practices

Drak drak at zikula.org
Thu Dec 19 15:46:58 UTC 2013

On 19 December 2013 13:17, Peter Todd <pete at petertodd.org> wrote:

> ** Fees
> Wallets MUST give users the ability to set the fee per KB they are
> willing to pay for their transactions. Wallets SHOULD allow users to
> change that fee after the fact via transction replacement.

Can you add a part about SHOULD/MUST warn users if the fee is unusually
high to avoid sob-stories of people sending 20BTC fees with for the
0.002BTC sandwich.

Sourcecode MUST be PGP signed on a regular basis. Releases MUST be
> signed - in git this is accomplished by signing the release tag.
> Individual commits SHOULD be signed, particularly if source-code used in

"SHOULD be cryptographically signed" I assume.

> ** SSL/Certificate authorties
> While certificate authorities are notoriously bad at the job they are
> supposed to be doing the CA system is still better than nothing - use it
> where appropriate. For instance if you have a website advertising your
> software, use https rather than http.

Once could make efforts to publish (maybe even as signed commits in the git
repo etc the current valid certificate fingerprints and which CA signed
it). This would go some way to exposing
MITM either by CA or in workplaces where browsers are loaded with bogus CAs
for the purpose
of deep packet inspection.

> ** Multi-factor spend authorization, AKA multisig wallets
> <mainly discussed at the conference in terms of multiple individuals
> controlling funds, which is out of scope for this document>
> Assuming any individual device is uncompromised is risky; wallet
> software SHOULD support some form of multi-factor protection of some or
> all wallet funds. Note that this is a weak "should"; mainly we want to

According to RFC 2119 <http://www.ietf.org/rfc/rfc2119.txt> language, you
might be better using the word RECOMMENDED or MAY over SHOULD here.

Additionally, at the beginning of the spec I would put :

"The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
document are to be interpreted as described in RFC


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