Gavin Andresen - 2011-01-28 00:36:12

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That would make an odd transaction pattern-- e.g. if you started with 11 bitcoins in your wallet, you'd generate a chain of transactions that was:

A paid B 11 bitcoins
B paid C 11 bitcoins
C paid D 11 bitcoins
 ... etc, every 6 hours.  That makes it obvious what you're doing (a series of exactly-11-bitcoin transactions would be extremely unlikely).

Ideally, you want the graph of transactions involving your coins to be indistinguishable from a random sub-graph of the entire bitcoin transaction graph.  Creating lots of wallets won't help you do that; you need to mix your coins with other people's, so the mixing looks the same as just ordinary "X paid Y" transactions.