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Git and BlockChain are both based on the Merkle tree data structure. So you could pretty easily prototype a text-based diff/merge-able schema with a single file via git, and then implement the protocol as a smart contract when you figure out the semantics. Multi-file might map to a KeyValue store such as what's implemented with IBM HLF/Composer. I guess something like the protobuf schema evolution rules would be good inspiration as well.

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No criticism intended but how is git based on a merkle tree? Commits reference each others hash to build a DAG, but in a merkle tree, if I understand correctly, the non-leaf nodes are actually only having the purpose of simplifying a hash check of the underlying leaf nodes, a tradeoff between processing (checking all the hashes) and storage space (storing the non-leaf nodes additionally to the actual data). Just learned about a few days ago though, might be incorrect.

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