It has also received funds from wallets Arkham labels as a Nexo hot wallet and Prime Trust custody.
The newly arrived 50 BTC remained in the address as of Friday morning. That means there is no on-chain evidence that the dormant coins themselves have been sent to FalconX, another exchange or sold.
A 2011 wallet's coins landed in an address that has sold through a prime broker before. (Shaurya Malwa/CoinDesk)
Dormant wallets from bitcoin's earliest years tend to draw attention when they move because their owners accumulated coins when the asset was worth a fraction of today's price.
While movement alone gives little indication of what the holder plans to do next, and transfers can reflect anything from wallet upgrades and custody changes to preparations for a sale.
The movements come on the back of one of the worst cold-wallet exploits to hit Bitcoin in years, a reminder that coins can sit safely for more than a decade and still become vulnerable when the software protecting their keys fails.
Coinkite, maker of the Coldcard hardware wallet, urged users on Tuesday to move funds after disclosing a flaw in firmware dating to 2021 that could expose keys generated by affected devices. Attackers have swept as much as $114 million from vulnerable wallets since July 30, according to the company, in four waves of thefts.