One unfortunate Brit may be watching bitcoin's charge towards the $12,000 barrier with a sinking feeling after throwing out a laptop with an estimated $100m (£74m) of the crypto-currency locked in it.
Welsh IT worker James Howells was an early bitcoin investor. But four years ago he threw out his old computer that had the ownership codes to 7,500 bitcoins.
Howells' mistake was costly enough at the time, with him losing around $700,000. But with the surge in bitcoin, the value he now estimates his stake would be worth around $100m.
The 32-year-old said he first started mining bitcoin on his Dell laptop in February 2009.
"However, I kept the hard drive in a drawer at home knowing it contained my bitcoin private keys, so that if bitcoin did become valuable one day I would still have the coins I had mined.
In mid-2013 during a clear-out, the hard drive - then worth a few hundred thousand pounds - was mistakenly thrown out and put into a general waste bin at my local landfill site, after which it was buried on site.
Howells said he thinks the computer may be located in the Docks Way landfill site in Newport, South Wales.