By James Royal, Ph.D., Bankrate.com

While Bitcoin spent the last decade soaring and making millionaires out of many people, other owners of the world’s largest cryptocurrency have missed out. Why? One major reason: They’ve lost access to their account. In fact, more than $400 billion in Bitcoin is estimated to be lost — but some is recoverable, says at least one firm.

A 2023 report from Unchained Capital, a Bitcoin financial services company, estimated that up to 3.8 million bitcoins have been lost. That’s out of a total of about 19.9 million in existence today, and a maximum supply of 21 million tokens when Bitcoin is fully mined. That could mean as much as 19% of today’s supply is gone forever. Or is it?

Traders who have lost access to their Bitcoin or other digital currencies and

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