How to format JSON file before signing it?

[MuxZeroNet]

What deterministic algorithms/formatting parameters are used to format a JSON file for signing?

• Identation method?
• Sort keys?
• Which keys are removed prior to signing?

[HelloZeroNet]

I have added specification on the dumped json format: https://zeronet.readthedocs.io/en/latest/site_development/content_json/#signs

Unfortunately I have not found any offical specification on standard Bitcoin message signature format, so I added the PR's link.

[MuxZeroNet]

Electrum is especially infamous for not following the conventions the rest of the crypto community agreed on. It has a different serialization format, and adds a message-dependent magic header to the signed message. In the documentation, you may need to note this inconsistency.

[HelloZeroNet]

I have added some corrections, please feel free to edit it if you think it need some more changes: https://zeronet.readthedocs.io/en/latest/site_development/content_json/#signs