[mindcandy]

There are companies that specialize in coordinating large, off-exchange trades. I listened to an interview where they mentioned security practices such as: keys are stored on laptops that were bought new, had the hard drive replaced, and the Ethernet and USB ports epoxied shut. All transactions are offline and multi-sig. Etc...

[duxup]

Yeah I was thinking the security would have to be pretty high / multi layered / rightfully paranoid.

[atomical]

Ledger offers enterprise grade solutions for this now.

https://www.ledger.com/enterprise-solutions/