2010

05-22 Laszlo first to buy pizza with Bitcoins agreeing upon paying 10,000 BTC for ~$25 worth of pizza courtesy of jercos²

07-07 Bitcoin v0.3 released³
07-11 Bitcoin v0.3 release mentioned on slashdot⁴, bringing a large influx of new bitcoin users.
07-12 Beginning of a 10x increase in exchange value over a 5 day period, from about $0.008/BTC to $0.08/BTC
07-17 MtGox⁵ established
07-18 ArtForz⁶ generated his first block after establishing his personal OpenCL GPU hash farm

08-15 Bug in the bitcoin code allows a bad transaction into block 74638. Users quickly adopt fixed code and the “good” block chain overtook the bad one at a block height of 74691, 53 blocks later⁷.

09-14 jgarzik offered⁸ 10,000 BTC (valued at ~$600-650) to puddinpop to open source their windows-based CUDA client
09-14 Block 79764⁹ is first to be mined using split allocation of the generation reward.
09-18 puddinpop released¹⁰ source to their windows-based CUDA client under MIT license
09-29 kermit discovered¹¹ a microtransactions exploit which precipitated the Bitcoin v0.3.13 release

10-01 First public OpenCL miner released¹²
10-07Exchange rate started climbing up from $0.06/BTC after several flat months.
10-16 First recorded escrowed bitcoin trade conducted, between nanotube and Diablo-D3, escrowed by theymos.
10-17 #bitcoin-otc trading channel established on freenode IRC.
10-28 First bitcoin short sale transaction initiated, with a loan of 100 BTC by nanotube to kiba¹³, facilitated by the #bitcoin-otc market.

11-06 The Bitcoin economy passed US $1 million¹⁴. The MtGox price touched USD $0.50/BTC.

12-07 Bitcoind was compiled for the Nokia N900 mobile computer by doublec. The following day, ribuck sent him 0.42 BTC in the first portable- to-portable Bitcoin transaction.
12-09 The generation difficulty passed 10,000.
12-09 First bitcoin call option contract sold, from nanotube to sgornick¹⁵, via the #bitcoin-otc market.
12-16 Bitcoin Pooled Mining¹⁶, operated by slush, found its first block