The popular Bitcoin hardware wallet Coldcard product, made by Coinkite, is at risk following a $70 million hack.

Coinkite on Thursday admitted that its Coldcard Mk3 model was affected following the hack and advised users to move their funds. Then, on Friday, the company said that users of the later hardware devices Mk4, Mk5, and Q should also take precautions. 

Hackers on Thursday were first able to drain funds from 1,196 Bitcoin addresses because their private keys were not generated using sufficient entropy — or randomness. 

Since then, a total of 1,082.65 Bitcoins have disappeared from wallets, according to data from Galaxy Research and engineers at payments company Block.