Written to the chain on 06 Apr 2013, block 229,999.
A leaked private signing key for American Megatrends firmware, published to the chain where it cannot be recalled. It is the clearest demonstration of what permanence means when the content is something someone wants erased: the key is as unrecoverable now as any bitcoin sent to a burn address. Its contents are not reproduced here.
Bare multisig outputs list several public keys and say how many signatures are needed to spend them. Uploaders discovered that the public-key slots could carry arbitrary bytes. A transaction can include many such multisig outputs, each carrying one or more fake key-sized chunks.
More about P2FMSEvery byte shown here was read from these transactions. Open one in a block explorer to check it yourself.
