Written to the chain on 13 Mar 2021, block 408,680.
Nested AtomSea object (#Seikilos #epitaph). The 8 data chunks are indexed on Bitcoin; the MIDI (format 1, 2 tracks) is complete in the first 5 on-chain chunks. Chunks 6-7 are off-Bitcoin (author profile image) and irrelevant to the MIDI; skip_missing tolerates them and carve-midi trims the bio/profile wrapper using the MThd/MTrk lengths.
AtomSea and EMBII built a higher-level publishing system on top of fake-key-hash style storage. A top-level transaction acts like an index: it contains ordered transaction IDs, length markers, filenames, captions, and sometimes profile or signature metadata.
More about AtomSea-P2FKEvery byte shown here was read from these transactions. Open one in a block explorer to check it yourself.
