why us a 64 byte long CID?

[DougAnderson444]

Is there any particular reason Sha3-512 is used here?

provenance-log/src/entry.rs

Line 358 in ef969ff

&mh::Builder::new_from_bytes(Codec::Sha3512, v.as_slice())

I ask because it makes the CIDs longer. Sha2-256 or Blake3 256 would be 32 byte CIDs.

Is there a reason for this extra length?