More than 14 years after going silent, two bitcoin wallet addresses have suddenly sprung back to life, moving a massive 20,000 BTC late Thursday night, according to onchain data. These addresses first received their bitcoin in April 2011, when the wallet “1HqXB…gDwcK” split 23,377.83 BTC across three destinations. Two of those addresses each got 10,000 BTC, while the third received the rest of the funds.

Late Thursday night and into early Friday morning, those same two addresses — “12tLs…xj2me” and “1KbrS…AWJYm” — moved their entire 10,000 BTC holdings to fresh destinations within 30 minutes of each other, blockchain data shows. The third address had already moved its BTC years ago, but these two remained untouched until now. The new receiving addresses have yet to move the bitcoin.

Valued at only $7,800 in 2011, this 20,000 BTC has now skyrocketed to a jaw-dropping $2.18 billion, representing a stunning 13,982,800 percent gain. The reason behind the sudden moves and who controls the wallets remains a mystery, according to blockchain data.