New TZIP draft: string signing

We request comments on a new draft TZIP concerning process and interface standards for signing messages off-chain with Tezos keys.

This proposed standard documents a “temporary message signing” convention already in use in some Tezos applications.

See a rendered view of the draft proposal as of 2022/05/06. [edit: obsolete, see below]

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One suggestion (by @codecrafting) is to also define a format for bundling everything needed to verify the signature for a message, something like this:

-----BEGIN TEZOS SIGNED MESSAGE-----
%message
-----BEGIN SIGNATURE-----
%publicKey
%signature
-----END TEZOS SIGNED MESSAGE-----

Where %message, %publicKey, and %signature are placeholders for the obvious particular values.

This is similar to a convention used in Bitcoin.

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I have updated this draft TZIP to correct the specification of which character codes are allowed in the string values (only 7-bit ASCII, not UTF-8), and to add the message/signature text interchange format mentioned in the prior comment.

See the new rendered draft as of 2022/05/14.

The TZIP draft no longer refers to current implementations by name.

See version 6 of the draft.

tzSig is a simple web app demonstrating use of this proposed standard.