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Re:Mt. Gox's Bitcoins are being sold on Bitstamp? by yetfeo on Sunday March 23, 2014 @06:27PM (#7455516)
blockchain.info has a method of tainting and tracking coins:

https://blockchain.info/tags?form_type=1

Taint is viewable using "Related tags" and "Taint Analysis" on address pages.

Re:Mt. Gox's Bitcoins are being sold on Bitstamp? by nwh on Sunday March 23, 2014 @07:13PM (#7455692)
It's widely regarded as complete bullshit and can be fooled by almost anybody who cares to.