Content hashes

More concepts

• TreeEach folder references its children by hash. A file change changes the hashes of its ancestors.
• SignSign a message with an Ed25519 key; change a byte or the key and verification fails.
• StreamingSplit a file into chunks and verify them during transfer.
• PushSplit a file into hash-named chunks on push and send only the ones that changed.
• AttestSign a statement about a commit, such as a review or test result.