Where are my cryptocurrency assets held?

Cryptocurrency trading through Interactive Brokers Hong Kong is powered by OSL Digital Securities, the world's first Type 1 and 7 Securities and Futures Commission (SFC)-licensed digital asset brokerage and trading platform for professional investors. Interactive Brokers HK customer positions will be maintained 100% in wallets in cold storage with OSL Digital Securities.

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Are cryptocurrency positions marginable?
Is Interactive Brokers Hong Kong Limited a member of the SEHK?
How long does it take for cryptocurrency trades to settle?
Which versions of TWS support cryptocurrency trading?