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### Register File Types
tree: SLEEP merkel tree
magic: 0x05025702
entry-size: 40 bytes
algorithm name: 'BLAKE2b' (len=7)
entry: 32-byte BLAKE2b node hash + 8-byte Uint64BE length
signatures: SLEEP array
magic: 0x05025701
entry-size: 65
algorithm name: 'Ed25519' (len=7)
entry: 64-byte Ed25519 signature
bitfield: SLEEP array of bitfields
magic: 0x05025700
entry-size: 3328
algorithm name: '' (len=0)
entry: 1024 bytes data, 2048 bytes tree, 256 bitfield
key: public key
no header, raw bytes
data
no header, raw bytes, concatonated
### Register API
SleepDirectoryRegister struct
open(directory, prefix)
create(directory, prefix, options)
file handles for tree, sig, bitfield, data; key is write-once
has(index) -> bool
has_all() -> bool
has_range(start, end) -> bool
get(index) -> data (arbitrary length)
append(entry) -> index written
len() -> u64
len_bytes() -> u64
verify() -> bool (verifies merkel tree against data, and signatures)
check() -> bool (quick consistency check of lengths, etc)
writable() -> bool
read_block(start, end) -> read api implementer
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