How many Bitcoins have been lost due to forgotten passwords?

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An Estimated Four Million Bitcoins Are Lost Due to Forgotten Passwords

Approximately four million of the 19 million Bitcoin units currently in circulation are considered lost, largely due to owners forgetting passwords or losing access to the digital wallets where they are stored. This loss primarily affects early adopters who may have stored their cryptocurrency on USB drives or other physical media and subsequently misplaced them or forgot the access credentials. The value of these lost Bitcoins is substantial, given the cryptocurrency's fluctuating but significant market price.
Forgotten Passwords Lead to Irrecoverable Losses

A significant portion of lost Bitcoins stems from owners forgetting the passwords required to access their digital wallets. This was particularly common in the early days of Bitcoin, when users often hoarded coins on USB sticks. One notable instance involves a US developer who lost access to 7,002 Bitcoins, valued at approximately US$280 million at the time, because he could not recall the password for a USB drive containing the cryptocurrency.
Accidental Disposal of Storage Devices

In other cases, the loss is due to accidental disposal of the physical storage devices holding the Bitcoins. A Welshman named James Howells is seeking permission from his local authority to excavate a landfill site. He believes a hard drive containing an estimated US$270 million worth of Bitcoin was accidentally thrown away and subsequently buried. The local council has reportedly refused his request due to the costs and logistical challenges involved in such an undertaking.
Early Adopters and Long-Term Holdings Contribute to Losses

Many of the lost Bitcoins were acquired during Bitcoin's nascent stages when its value was significantly lower. Economists estimate that roughly one in five Bitcoins in circulation today have remained unmoved for five years, a period when the unit's value was considerably less than US$100. It is also suggested that one to two million of these untouched Bitcoins may belong to Satoshi Nakamoto, the pseudonymous creator of Bitcoin.

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How many Bitcoins have been lost due to forgotten passwords?

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