Originally Posted by rowan

Here's the addr that had over 1 billion dollars (in today's value) as a balance:

https://blockchain.info/address/1933...vqCn32k2buXY8a

See all those little deposits? Those are tracers, small amounts which people send to the address, so they can try to associate different addresses with the same wallet. To create a transaction you need the private keys for all funds associated with it, so if a transaction bundles two or more separate addresses together, that means they came from the same wallet.

That address still has a small balance remaining, because of those tracer deposits, even though the balance was cleared out in 2014.