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+---
+layout: default
+title: 'Re: Questions about BitCoin'
+date: 2009-04-18 18:16
+grand_parent: Emails
+parent: Mike Hearn
+nav_order: 5
+---
+
+# Re: Questions about BitCoin
+
+The email on the Cryptography Mailing List that announced Bitcoin publicly to the world.
+{: .fs-6 .fw-300 } 
+
+---
+
+```
+From: Satoshi Nakamoto <satoshin@gmx.com>
+Date: Sat, Apr 18, 2009 at 6:16 PM
+To: Mike Hearn <mike@plan99.net>
+Subject: Re: Questions about BitCoin
+ 
+I sent back 32.51 and 50.00.
+ 
+I badly wanted to find some way to include a comment with indirect transfers, but there just wasn't a way to do it.  Bitcoin uses EC-DSA, which was essential for making the block chain compact enough to be practical with today's technology because its signatures are an order of magnitude smaller than RSA.  But EC-DSA can't encrypt messages like RSA, it can only be used to verify signatures.
+```