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j"1LAnZuoQdcKCkpDBKQMCgziGMoPC4VQUckM<div class="post"><div class="quoteheader"><a href="https://bitcointalk.org/index.php?topic=30.msg1161#msg1161">Quote from: DataWraith on May 19, 2010, 07:52:42 PM</a></div><div class="quote">Can I just butt in with a question on why that is? To me it seems that if Bitcoin uses public-key cryptography to transfer ownership of the coins, it should be a trivial matter to include a short message that is only readable by the recipient.<br/></div>Almost but not quite. Bitcoin uses EC-DSA, which can only do digital signing, not encryption. RSA can do both, but I didn't use it because it's an order of magnitude bigger and would have been impractical.</div> text/html
https://whatsonchain.com/tx/d42330840a58c063835346fdb4c2535ee3b2fdeaabf696cd75a0bab23a7258e5