An earlier version of the repo commit format (v2) had a "prev" field, which referenced the previous commit by hash. This is vaguely blockchain-ish in that you c

An earlier version of the repo commit format (v2) had a "prev" field, which referenced the previous commit by hash. This is vaguely blockchain-ish in that you could follow the chain all the way back to the first commit*, but even then, you still didn't need the prior versions to verify the current version. In "repo v3", the prev field still exists but is optional, and in practice it isn't used. *unless the repo had been "rebased"