2017 · 8 recorded events
What happened in crypto in 2017? All 8 events on this timeline, including SegWit Activates on Bitcoin — each dated, categorised and sourced.
2017 is the year crypto became a mass-market phenomenon, and the year the block-size war ended by exit rather than agreement. Bitcoin Cash forked away in August to raise the block limit to 8 MB; three weeks later SegWit activated on Bitcoin, fixing transaction malleability and clearing the path to Lightning. China removed itself from the market in September, first banning ICOs and then ordering domestic exchanges to stop yuan trading. Ethereum shipped Byzantium in October and was promptly congested by CryptoKitties, the first proof that a consumer application could saturate a chain. The year closed on 17 December with two entries on the same date: CME's futures listing and a peak near $19,800.
By category, 2017 breaks down into three technical milestones, two regulatory and policy decisions, one network launch, one market milestone and one adoption or institutional entry.
Technical Milestones
Network Launches
Market Milestones
Regulation & Policy
Adoption & Institutions
Every entry gives the date it happened, its category, a factual summary, and links to the original source and to the same entry in the full timeline.
After years of deadlock over scaling, one faction forked at block 478,558 to raise the block size to 8 MB. Bitcoin Cash gave every BTC holder an equal balance on the new chain and settled the block-size war by exit rather than by consensus.
Segregated Witness moved signature data outside the transaction body at block 481,824, fixing transaction malleability and raising effective capacity. By making malleability a non-issue it unlocked the Lightning Network, and it remains Bitcoin's most consequential soft fork.
Seven agencies led by the People's Bank of China declared token fundraising an illegal public financing activity, ordered refunds to participants and halted all ongoing sales. The global ICO market fell sharply within days and issuance shifted to Switzerland, Singapore and Gibraltar.
Regulators told BTCChina, Huobi and OKCoin to end yuan trading. China had accounted for a large share of global volume; the shutdown pushed those businesses offshore, seeded Binance's rise, and moved price discovery to Tether-denominated markets.
The first half of the Metropolis upgrade landed at block 4,370,000, adding zk-SNARK-friendly precompiles, the REVERT opcode and cheaper cryptographic operations, while cutting block rewards from 5 to 3 ETH. It laid the groundwork for privacy tooling and rollups.
Dapper Labs launched a breeding game built on the ERC-721 standard. Within a week it consumed a large share of Ethereum's block space, pushed gas fees to record highs and delayed ordinary transactions — the first proof that consumer applications could saturate a blockchain, and the origin of the NFT market.
A week after CBOE, the CME launched cash-settled bitcoin futures, giving institutions a regulated way to take either side of the trade. Shorting bitcoin became straightforward for the first time, and the listing coincided almost exactly with the top of the 2017 bull market.
Bitcoin topped out around $19,783 after a year that took it up roughly twentyfold, with retail queues at Coinbase and futures listings on two US exchanges. It marked the peak of the ICO cycle; the price fell more than 80% over the following twelve months.
This archive keeps a page for every year from 2008 to 2026. The sparser pre-Bitcoin entries from 1979 onward live in the full timeline.
