Re: [Multiformats] New versions of Multibase and Multihash published

[Melvin Carvalho <[e-mail]>]

út 5. 9. 2023 v 20:12 odesílatel Melvin Carvalho <[e-mail]>
napsal:

>
>
> ne 20. 8. 2023 v 17:24 odesílatel Manu Sporny <[e-mail]>
> napsal:
>
>> On Sun, Aug 20, 2023 at 10:57 AM Melvin Carvalho
>> <[e-mail]> wrote:
>> > Is it back compat (ie using the same string of characters) with the
>> widely used CID format?
>>
>> The short answer is "yes, almost certainly".
>>
>> If by "widely used CID format", you mean the Multicodec headers 0x01,
>> 0x02 and 0x03, then yes, nothing in these specifications prevent the
>> usage of those headers in a Multibase-encoded value and the Multihash
>> value headers don't conflict with the CID value headers.
>>
>> However...
>>
>> > Can I turn a CID into a URI and what would that look like?
>> >
>> > mh://<cid>
>> >
>> > ni://mh/<cid>
>> >
>> > Something like this?
>>
>> No, because CIDs are not file hashes, so you can't just use Multihash for
>> them:
>>
>
> I believe using a CID as an identifier is crucial, given its wide
> deployment and the need for character-to-character comparison. I had
> anticipated that this group would address this. How can we incorporate a
> CID into a URI? Does the spec not cover this, necessitating a new URI
> scheme? Implementing another scheme might seem redundant, but if needed, we
> can explore it. There seems great utility in reusing the widely deployed
> CID format can be seamlessly integrated into a URI while maintaining its
> character integrity.
>

Two possible ways forward:

Two possible suggestions:

1. a second standardization effort around cid: or urn:cid: which includes
multihash identifiers

2. try and incoporate a way to express a CID character for character in the
existing work.

There is a need to capture CIDs and identifiers, without changing the
encoding.


>
>
>>
>>
>> https://docs.ipfs.tech/concepts/content-addressing/#cids-are-not-file-hashes
>>
>> IOW, nothing we're doing here precludes encoding a CID in a Multibase
>> value... but CIDs (all versions of them) contain more information than
>> just the content hash itself (which is all Multihash encodes). We are
>> not standardizing CIDs at this point in time, but we're not precluding
>> their usage or future standardization, either.
>>
>> -- manu
>>
>> --
>> Manu Sporny - https://www.linkedin.com/in/manusporny/
>> Founder/CEO - Digital Bazaar, Inc.
>> https://www.digitalbazaar.com/
>>
>