Prior Art & Related Projects

• LiveJournal's photo hosting, my first experiment with content-addressable storage, which led to:
• Brackup, my original content-addressable backup tool, but didn't store directories as the digest of their contents. (so backup manifests were huge)
• Git, which exposed me to the idea of hashing directories, commits, etc. But git probably got it from Venti / Fossil:
• Venti / Fossil, apparently pioneered the idea of recursive content-addressable file systems.
• Monotone's "Certificates" are similar to Camli claims.

Probably more, though. Contributions to this list are welcome!