That's just dust spam. Anyone can send any OP_RETURN to any address. It doesn't mean or prove anything. If someone wanted to makebroadcast a message to prove ownership of the address on-chain, he'd do it from that address.
Original archivedRe: How do I recover my old bitcoins?
That's just dust spam. Anyone can send any OP_RETURN to any address. It doesn't mean or prove anything. If someone wanted to make a message to prove ownership of the address on-chain, he'd do it from that address.