This needs to be greater than 84 chars which happens to be 84 bytes so there is no chance it gets replayed on the bitcoin chain. Cant be bothered to count how many chars I have typed so hopefully this is enough...
OP_RETURN · Output 0Block 968,994
WORDS ON THE CHAIN
A message written into Bitcoin.
Public transaction data, shown as written. The writer’s identity and claims are not verified.