A significant portion of Bitcoin's history is tied to the infamous Mt. Gox hack of March 2011. The incident resulted in a large number of Bitcoins being drained from the exchange's hot wallet, with 79,957 $BTC ultimately ending up in an address that has remained untouched ever since.
The address, known as 1FeexV6bAHb8ybZjqQMjJrcCrHGW9sb6uF, contains coins worth approximately $5.4 billion at today's market value. Despite its sizeable value, the wallet has shown no outgoing transactions in over 15 years.
The theft was linked to Mt. Gox's hot wallet through blockchain records, and investigators have been unable to determine how the coins were subsequently moved. In recent years, occasional 'dust' transactions have appeared on the address, but these have not resulted in any movement of funds.