Bitcoin calendar.
Halvings and network upgrades, the US releases that move markets, conferences, and the anniversaries of Bitcoin's history. Dates are in UTC.
In 3 days
Bitcoin Amsterdam
ConferencesThursday 5 November
BTC Inc's European Bitcoin conference.
July 2015
| Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4BIP 66 split | 5 | ||
| 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| 27 | 28 | 29 | 30 | 31 |
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Events in July 2015
Saturday 4 July4139 days ago
The July 2015 chain split
Just after the BIP 66 upgrade took effect, a small miner produced an invalid block at height 363,731, and large pools that were building on new blocks without checking them first ("SPV mining") added five more blocks on top. The valid chain overtook the six invalid blocks about an hour and a half later, and lightweight wallets were advised to wait for extra confirmations.
NetworkSee block 363,731SourceBitcoin.org, Some miners generating invalid blocks (alert of 4 July 2015, all times UTC)