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First, we need a few bytes of gibberish data to create a unique address, so why not “6274636c65616b2e636f6d”, which happens to be the hexadecimal representation of the ASCII string “btcleak.com” (cheesy?). Our script is thus: OP_RETURN 11 0x6274636c65616b2e636f6d A few short comments about it. The “11” in it is simply the number of bytes that follow, and somewhat confusingly, they are written as a “normal” decimal number, which is followed by a hexadecimal string.