The day Bitcoin almost died — and Satoshi saved it.
August 15, 2010.
Block #74638.
An anonymous attacker exploited a flaw in Bitcoin’s code and minted 184 billion BTC out of thin air.
Yes, 184,467,440,737.09551616 BTC — more than 8,000x the max supply.
It was called the "value overflow incident."
Here’s what went wrong:
In Bitcoin’s code, outputs and inputs are calculated using a data type called “signed integers.”
But the code didn’t properly check if the sum of outputs was greater than inputs.
The attacker sent a transaction with 0.5 BTC in… and got 92 billion BTC out — twice in one transaction.
The bug was buried deep.
It bypassed the basic rules of Bitcoin:
21 million cap? Broken.
Scarcity? Gone.
Trust? Shattered… almost.
But Satoshi Nakamoto was watching.
Within 24 hours, Satoshi released Bitcoin v0.3.10 — a patch that:
Rejected the invalid block.
Ignored the corrupted chain.
Restored the ledger to its prior state.
The chain was rolled back.
The fake BTC was erased.
The network survived.
This was one of the only times in history the Bitcoin blockchain was reversed.
It never happened again.
Bitcoin learned.
The code got stricter.
Satoshi eventually stepped back, never to return.
But on that day, Bitcoin didn’t just survive —
It proved that open-source, decentralized money could defend itself.
And it’s been bulletproof ever since.
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