Bitcoin’s Biggest Lost Fortunes: 8 Costly Mistakes Owners Can Never Undo

Bitcoin’s price remains well below its October 2025 peak, yet early adopters who kept their private keys have amassed fortunes. At the same time, a series of high‑profile mishaps have erased billions of dollars in value, underscoring the challenges of self‑custody.

Notable Lost Fortunes

James Howells – Landfill Hard Drive

Howells, a former miner from Newport, Wales, discarded a laptop hard drive that contained the private keys to an estimated 7,500‑8,000 BTC. At current prices, the lost coins are valued at roughly $578 million. He has spent more than a decade seeking permission to excavate the landfill but has not succeeded.

Stefan Thomas – Two Guesses Left

Programmer Thomas stored his private key on an encrypted IronKey USB drive. After losing the paper with the password, he has used eight of the ten allowed attempts to access 7,002 BTC (about $540 million). He has halted further guesses, leaving only two attempts remaining.

Stranded Change Address – 9,000 BTC

An anonymous user restored an old wallet backup that did not recognize newer change addresses, leaving 9,000 BTC (approximately $694 million) inaccessible despite being visible on the blockchain.

Missed Refund – 100,000 BTC

According to a Substack post, a Missouri farmer named Samantha received a 2010 refund of 100,000 BTC from a European vendor. She later lost the private keys in a phishing incident, resulting in a loss valued at about $7.7 billion.

Campbell Simpson – Tossed Hard Drive

Australian tech figure Campbell Simpson discarded a hard drive in 2017 that held roughly 1,400 BTC (around $107 million). The drive was mixed with other junk and sent to a skip.

Shotukan – Brother’s Laptop

Reddit user Shotukan lost 533 BTC (about $41 million) after giving a laptop containing a Bitcoin wallet to his brother, who later passed away. The laptop was never recovered.

Gabriel Abed – Reformatted Laptop

Barbadian entrepreneur Gabriel Abed lost 800 BTC (approximately $64.8 million) when a colleague accidentally reformatted the laptop that stored his private keys.

Davyd Arakhamia – Encrypted File

Ukrainian MP Davyd Arakhamia encrypted a file that contained his private keys, mistaking it for a movie file. The error resulted in the loss of 400 BTC, valued at roughly $32 million.

Implications for Self‑Custody

These cases illustrate how forgotten passwords, discarded hardware, and accidental encryption can permanently remove large amounts of Bitcoin from circulation. While lost coins marginally reduce the total supply of 21 million BTC, the financial impact on individuals is severe. The industry has responded with improved recovery tools and user‑experience designs, but the risk remains for anyone managing private keys without adequate safeguards.