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Re:How the Bitcoins Were Stolen from Mt. Gox [video] by olegkikin on Monday September 18, 2017 @06:21AM (#15274632)
Some exchanges prove their reserves from time to time.

https://www.bitstamp.net/article/Bitstamp-BTC-Proof-of-Reser...

Re:How the Bitcoins Were Stolen from Mt. Gox [video] by AlexCoventry on Monday September 18, 2017 @01:00PM (#15277557)
I see how that shows their assets, but does it reflect their liabilities too? If not, it's not necessarily a proof of solvency.