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 11 days
Difficulty adjustment
NetworkThursday 12 November (estimate)
At block 975,744, mining is expected to get about 0.1% harder, so blocks keep arriving about every 10 minutes.
August 2021
| Monday | Tuesday | Wednesday | Thursday | Friday | Saturday | Sunday |
|---|---|---|---|---|---|---|
| 1UASF, 2017 | ||||||
| 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 9 | 10 | 11 | 12 | 13 | 14 | 15Overflow bug, 2010 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 |
| 23 | 24SegWit, 2017 | 25 | 26 | 27 | 28 | 29 |
| 30 | 31 |
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Events in August 2021
Sunday 1 August1918 days ago
The user-activated soft fork (BIP 148) takes effect, 2017
4 years ago. BIP 148, the "user-activated soft fork" (UASF), took effect at block 478,484: nodes running it would reject any block that did not signal support for SegWit. Miners were already signalling after a compromise proposal, BIP 91, so no split followed from it.
NetworkSee block 478,484SourceBIP 148, Mandatory activation of segwit deployment (from midnight 1 August 2017 UTC)
Sunday 15 August1904 days ago
The value overflow incident, 2010
11 years ago. A transaction in block 74,638 created about 184 billion bitcoin by exploiting a bug in how the software added up large amounts. Satoshi Nakamoto released a fix, Bitcoin 0.3.10, the same day, and the network replaced the bad block.
NetworkSee block 74,638SourceBitcoin Wiki, Value overflow incident
Tuesday 24 August1895 days ago
SegWit activates, 2017
4 years ago. Segregated Witness (SegWit) took effect at block 481,824. It moves signatures into a separate part of the block, which fixes transaction malleability (the ability to change a transaction's ID before it confirms) and raises block capacity.
NetworkSee block 481,824SourceBitcoin Core source, SegwitHeight = 481824 with the block hash