Invalid public key was spent! How was this possible? From previous questions this bitcoin 1FYMZEHnszCHKTBdFZ2DLrUuk3dGwYKQxh address had an invalid public key of "00" and was unspendable but the coins are now spent?? The invalid key was generated by a bug in the wallet software the owner was using and should have been "locked" due to the invalid key

see link to the owners original query
https://www.reddit.com/r/Bitcoin/comments/2t3vn0/i_cant_send_my_btc_a_triangle_apear_i_use_multibit/

also see link to a paper that lists that this is an invalid key
https://www.microsoft.com/en-us/research/wp-content/uploads/2013/11/734.pdf?from=http%3A%2F%2Fresearch.microsoft.com%2Fpubs%2F204914%2F734.pdf

see page 11
That address cannot be spent from and any such transaction that spends from it is invalid. However this does not prevent improperly written software from thinking its private key is a valid private and and performing the elliptic curve operations on it. So thus the address was created and a transaction was created that appears valid. But when validating the transaction with proper software, such software rejects it.

This transaction appears on blockchain.info likely because their software is either improperly implemented or simply not validating (or fully validating) transactions. This isn't the first time that's happened though.