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Subject: Re: [Bitcoin-development] determining change addresses using the
 least significant digits
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On 02/04/2015 02:23 PM, Isidor Zeuner wrote:
> Hi there,
> 
> traditionally, the Bitcoin client strives to hide which output 
> addresses are change addresses going back to the payer. However, 
> especially with today's dynamically calculated miner fees, this may
> often be ineffective:
> 
> A user sending a payment using the Bitcoin client will usually
> enter the payment amount only up to the number of digits which are 
> considered to be significant enough. So, the least significant
> digits will often be zero for the payment. With dynamically
> calculated miner fees, this will often not be the case for the
> change amount, making it easy for an observer to classify the
> output addresses.
> 
> A possible approach to handle this issue would be to add a
> randomized offset amount to the payment amount. This offset amount
> can be small in comparison to the payment amount.

Another possible approach is to randomize the number of change outputs
from transaction to transaction.

Doing this, it would be possible to make change outputs that mimic
real spends (low number of s.d.)

- -- 
Support online privacy by using email encryption whenever possible.
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