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June 2011:
- One user loses everything overnight
- 25,000 BTC disappear
- About $500,000 at that time
- Over $2.4 billion at current prices
The Victim:
A Bitcointalk user known as "Allinvain," one of the early Bitcoin miners
The theft occurred on June 13, 2011
The Main Transaction:
- Hundreds of UTXOs were consolidated
- The wallet was drained all at once
Destination Address:
1KPTdMb6p7H3YCwsyFqrEmKGmsHqe1Q3jg
How it happened:
- Slush Pool account was hacked
- The payout address was changed
- Credentials had already been leaked
Then the real mistake:
- wallet.dat stored unencrypted
- Running on Windows
- Mining software from multiple sources
The private keys were literally copied and 25,000 BTC were transferred in seconds
Hours later, the post appeared on Bitcointalk
Allinvain woke up to find his balance at zero
What followed:
- More BTC was sent to the same address
- Total received: 25,033 BTC
- Funds were split and transferred slowly
Today:
- Almost everything has been spent
- Only 0.004 #BTC remains
The attacker was never found