Viewing a codebase as an immutable, content addressable tree: https://unisonweb.org/2016-09-17/editing.html (enables some really interesting features!)
miniblog.
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Multihash is a rather nifty format for hashes, where you can distinguish between e.g. a SHA1 and a Blake2b: https://multiformats.io/multihash/
It originates from the IPFS project, where they want flexibility in how they implement content-addressable storage.
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Hosting a Docker registry on IPFS! The global P2P content-addressable filesystem seems like a good fit for Docker images.