Bitcoin calendar.
Halvings and network upgrades, the US releases that move markets, conferences, and the anniversaries of Bitcoin's history. Dates are in UTC.
10 dates for network from 30 October 2026 to 30 October 2027.
November 2026
Friday 13 NovemberIn 14 days
Difficulty adjustment
At block 975,744, mining is expected to get about 4.1% easier, so blocks keep arriving about every 10 minutes.
Network · EstimateBlock 975,744
Saturday 14 NovemberIn 15 days
Taproot activates, 2021
5 years ago. The Taproot upgrade took effect at block 709,632. It added Schnorr signatures and a new kind of output that reveals less about complex spending conditions, making them cheaper and more private.
NetworkSee block 709,632SourceBIP 341, Deployment section ("The deployment did activate at height 709632")What happened
Saturday 28 NovemberIn 29 days
The first halving, 2012
14 years ago. At block 210,000 the reward for mining a block fell from 50 to 25 bitcoin, the first halving. The software halves the reward every 210,000 blocks, roughly every four years.
NetworkSee block 210,000SourceBitcoin Core source, nSubsidyHalvingInterval = 210000
April 2027
Tuesday 20 AprilIn 172 days
The fourth halving, 2024
3 years ago. At block 840,000 the reward for mining a block fell from 6.25 to 3.125 bitcoin, the fourth halving.
NetworkSee block 840,000SourceBitcoin Core source, nSubsidyHalvingInterval = 210000
May 2027
Tuesday 11 MayIn 193 days
The third halving, 2020
7 years ago. At block 630,000 the reward for mining a block fell from 12.5 to 6.25 bitcoin, the third halving.
NetworkSee block 630,000SourceBitcoin Core source, nSubsidyHalvingInterval = 210000
Sunday 30 MayIn 212 days
Block 1,000,000
Bitcoin's millionth block. Nothing changes in how Bitcoin works; it's a round number.
Network · EstimateBlock 1,000,000SourceWorked out from recent block times on mempool.space
July 2027
Friday 9 JulyIn 252 days
The second halving, 2016
11 years ago. At block 420,000 the reward for mining a block fell from 25 to 12.5 bitcoin, the second halving.
NetworkSee block 420,000SourceBitcoin Core source, nSubsidyHalvingInterval = 210000
August 2027
Sunday 1 AugustIn 275 days
The user-activated soft fork (BIP 148) takes effect, 2017
10 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 AugustIn 289 days
The value overflow incident, 2010
17 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 AugustIn 298 days
SegWit activates, 2017
10 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