2011 was the third year since the launch of Bitcoin. Dollar parity was achieved as Satoshi Nakamoto departed.
- 02 – Luke Dashjr standardizes Tonal Bitcoin.
- 08 – Bitcoin Pooled Mining reaches 10 Ghash/s.
- 28 – Block 105000 is mined, meaning the supply of bitcoins reaches 25% of its target.
- 09 – Bitcoin achieves dollar parity. 1 bitcoin trades for 1 US dollar on Mt. Gox.
- 10 – News of dollar parity attracts significant attention; bitcoin.org struggles to handle the traffic.
- 14 – For the first time, a vehicle is offered for a sum of bitcoins. It was a 1984 Celica Supra for 3000 BTC. A buyer was never found.
- 01 – Jed McCaleb sells Mt. Gox to Mark Karpelès.
- 06 – The network hashrate briefly doubles.
- 18 – BTC/USD exchange rate reaches a 6-week low point at almost $0.70/BTC, after what appeared to be a short burst of possibly automated sales at progressively lower prices. The price had been declining since dollar parity.
- 22 – WeUseCoins publishes What is Bitcoin?, which became a viral hit.
- 25 – Difficulty decreases for the second time ever.
- 27 – Britcoin is established, opening the first Bitcoin exchange for the Pound Sterling.
- 31 – Bitcoin Brazil is established, opening the first Bitcoin exchange for the Brazilian real.
- 05 – Bitmarket.eu is established, opening the first Bitcoin exchange for the Polish złoty.
- 12 – The first Bitcoin put option contract is sold on Bitcoin-OTC.
- 16 – TIME publishes an article on Bitcoin.
- 23 – The exchange rate reaches parity with the Euro and Pound Sterling.
- 27 – VirWoX is established, opening the first Bitcoin exchange for the Linden dollar.
- 30 – Difficulty tops 100,000.