Written to the chain on 01 Sep 2014, block 318,638.
An audio file stored on the chain in 2014, split across many transactions and indexed by a root transaction that records the order of the pieces. Sound was an unusual choice: audio is large, and every byte had to be paid for in transaction fees and burned coins.
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.
