decentralized-identity/didcomm-messaging

what is 'multi-hash'?

Opened this issue · 7 comments

gobengo commented

added here by @TelegramSam merged @tplooker

  • data: A JSON object that gives access to the actual content of the attachment. Contains the following subfields:
    ...
    • hash: The hash of the content encoded in multi-hash format. Optional. Used as an integrity check for the attachment, and > MUST be used if the data is referenced via the links data attribute.

What is 'multi-hash format' here? What should it hyperlink to as a specification and/or normative reference? 🙏

gobengo commented

Regardless of what to hyperlink to, does the reference generally refer to the same thing as what other DIF repos name 'multihash'?

i.e. https://multiformats.io/multihash/ - if so, you may want to keep an eye on this ietf multiformats list

  • 👍1
FabioPinheiro commented

I also think this multihash reference to the multiformats https://multiformats.io/multihash/
Basically describes itself:

  • the hash algorithm used
  • the length of the hash that follows
  • the real hash data
  • 👍1
TelegramSam commented

This spec predates a usable form of CESR. It has been posited that some future version may leverage CESR for encoding.

TelegramSam commented

We should add a link to the multi-hash spec. This is a clarification, and would not require a version change.

FabioPinheiro commented

multi-hash is another draft spec that seems that is expired.

https://datatracker.ietf.org/doc/draft-multiformats-multihash/07/