Stored at 375 × 198 px · shown at 1.5× Written to the chain on 21 Mar 2017, block 458,238.
The photograph of the unidentified man standing before a column of tanks near Tiananmen Square in June 1989 — an image censored in the country where it was taken. Storing it on the chain puts it beyond the reach of any single authority: every node that keeps a full copy of Bitcoin keeps this too.
A normal pay-to-public-key-hash output contains a 20-byte public-key hash. A data uploader can put arbitrary 20-byte chunks in that field instead. To the network it looks like many ordinary-looking outputs, but the “addresses” are fake because nobody knows a private key whose public key hashes to those bytes.
More about P2FKHEvery byte shown here was read from these transactions. Open one in a block explorer to check it yourself.
