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OP_Return Bot - Create Your Own Timestamp

http://opreturnbot.com/

About

An OP_RETURN is an provably prune-able output, these outputs do not need to be stored in the UTXO set but will be permanently part of the blockchain. These outputs can be used to add arbitrary data to the blockchain, creating a timestamp that it existed at a given time. OP_RETURN Bot will create an OP_RETURN output for you, you just need to pay the fees.

Summary