Update 6.md

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@@ -14,13 +14,12 @@ The email on the Cryptography Mailing List that announced Bitcoin publicly to th
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```
From: Satoshi Nakamoto <satoshin@gmx.com>
Date: Sat, Apr 18, 2009 at 10:52 PM
To: Mike Hearn <mike@plan99.net>
Subject: Re: Questions about BitCoin
```
Got the 50.
Transactions sent to a bitcoin address will always say "from: unknown". The transaction only tells who it's to. Sending by bitcoin address has a number of problems, but it's so nice having the fallback option to be able to send to anyone whether they're online or not. There are a number of ideas to try to improve things later. For now, if things work out like the real world where the vast majority of transactions are with merchants, they'll pretty much always make sure to set up to receive by IP. The P2P file sharing networks seem fairly successful at getting a large percentage of their users to set up their firewalls to forward a port.