Enable verifiable retrieval on the ipfs.io gateway

[reidlw]

eta: 2022-12-31

description:
Specification for gateway-verifiable retrieval and implementation in Kubo gateway code.

One major remaining issue is signed IPNS records. We will need to update IPFS specs to define how this works: ipfs/specs#320

Another issue: There is also perf. problem of multiple round-trips when requesting deep sub paths like /ipfs/cid/sub/dir/some/file.jpg → requires 5 requests (1CAR with file.jpg and 4 blocks, one for each dir level)

Done:

Update IPFS specs to define protocol changes to enable verifiable retrieval in all cases
Update (Kubo) Gateway code to address known deficiencies so that we can properly support verifiable retrieval from light clients

[github-actions]

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