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27 lines
866 B
Markdown
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layout: default
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title: 'Re: Questions about BitCoin'
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date: 2009-04-18 18:16
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grand_parent: Emails
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parent: Mike Hearn
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nav_order: 5
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---
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# Re: Questions about BitCoin
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The email on the Cryptography Mailing List that announced Bitcoin publicly to the world.
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{: .fs-6 .fw-300 }
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---
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```
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From: Satoshi Nakamoto <satoshin@gmx.com>
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Date: Sat, Apr 18, 2009 at 6:16 PM
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To: Mike Hearn <mike@plan99.net>
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Subject: Re: Questions about BitCoin
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I sent back 32.51 and 50.00.
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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.
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```
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