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Calendar

Bitcoin, month by month

The white paper, the genesis block, the halvings and the upgrades, each on its day, with a source.

Education onlySourced dates

Key fixed dates in bitcoin's history, month by month, so you can see what falls in any month. Each date comes from a primary source such as the block chain itself or the original mailing list and forum posts, and links to the explainer that goes with it. Block dates are in UTC, taken from the block timestamp.

This month: November 2026. It is outlined in the calendar and shaded in the list.

AnniversaryTodayEstimate

JanuaryThis month

FebruaryThis month

  • No fixed dates

MarchThis month

  • No fixed dates

AprilThis month

MayThis month

JuneThis month

  • No fixed dates

JulyThis month

AugustThis month

SeptemberThis month

  • No fixed dates

OctoberThis month

NovemberThis month

DecemberThis month

  • No fixed dates
Estimate

Next halving: block 1,050,000

Around April 2028

About 74,719 blocks to go at block 975,281 (checked 10 November 2026).

This is an estimate, not a fixed date. It assumes one block every 10 minutes on average, but real block times vary, so the actual date can move by weeks. The block subsidy will fall from 3.125 to 1.5625 BTC. The figure updates from mempool.space when the page loads. For what a halving means for a company, see the bitcoin halving and the four-year cycle.

Every date, in calendar order

  1. Genesis block

    Block 0, the first block of the chain, is created. Glossary: genesis block.

    Source: mempool.space: Block 0, the genesis block (3 January 2009).

  2. Bitcoin v0.1 announced

    The first release of the software is announced on the Cryptography mailing list. Bitcoin basics.

    Source: Cryptography mailing list: Satoshi Nakamoto, "Bitcoin v0.1 released", 8 January 2009.

  3. First transaction

    In block 170, Satoshi Nakamoto sends 10 BTC to Hal Finney, the first transaction between two people. How a transaction works.

    Source: mempool.space: Block 170: the first transaction between two people (12 January 2009), Bitcoin Forum: Hal Finney, "Bitcoin and me": recipient of the first bitcoin transaction.

  4. Fourth halving

    At block 840,000 the block subsidy falls from 6.25 to 3.125 BTC. The supply curve.

    Source: mempool.space: Block 840,000, the fourth halving (20 April 2024).

  5. Third halving

    At block 630,000 the block subsidy falls from 12.5 to 6.25 BTC. The supply curve.

    Source: mempool.space: Block 630,000, the third halving (11 May 2020).

  6. Bitcoin Pizza Day

    A forum member reports trading 10,000 bitcoins for pizza, often cited as the first purchase of goods with bitcoin. Adoption timeline.

    Source: Bitcoin Forum: Laszlo Hanyecz, "Pizza for bitcoins?" (report of the trade, 22 May 2010).

  7. Second halving

    At block 420,000 the block subsidy falls from 25 to 12.5 BTC. The supply curve.

    Source: mempool.space: Block 420,000, the second halving (9 July 2016).

  8. SegWit activates

    Segregated Witness activates at block 481,824. Glossary: SegWit.

    Source: Bitcoin BIPs: BIP 141: Segregated Witness (consensus layer), mempool.space: Block 481,824, SegWit activation (24 August 2017).

  9. White paper published

    Satoshi Nakamoto shares "Bitcoin: A Peer-to-Peer Electronic Cash System" on the Cryptography mailing list. Bitcoin basics.

    Source: Satoshi Nakamoto: Bitcoin: A Peer-to-Peer Electronic Cash System (white paper, 31 October 2008, PDF), Cryptography mailing list: Satoshi Nakamoto, "Bitcoin P2P e-cash paper", 31 October 2008.

  10. Taproot activates

    Taproot activates at block 709,632. Glossary: Taproot.

    Source: Bitcoin BIPs: BIP 341: Taproot, SegWit version 1 spending rules, mempool.space: Block 709,632, Taproot activation (14 November 2021).

  11. First halving

    At block 210,000 the block subsidy falls from 50 to 25 BTC. The supply curve.

    Source: mempool.space: Block 210,000, the first halving (28 November 2012).

For accounting rules, products and regulation, see the adoption timeline.

Sources

Primary sources only. Each link was checked on 29 October 2026. Rules change, so confirm the current version with your adviser.

  1. mempool.spaceBlock 0, the genesis block (3 January 2009)
  2. Cryptography mailing listSatoshi Nakamoto, "Bitcoin v0.1 released", 8 January 2009
  3. mempool.spaceBlock 170: the first transaction between two people (12 January 2009)
  4. Bitcoin ForumHal Finney, "Bitcoin and me": recipient of the first bitcoin transaction
  5. mempool.spaceBlock 840,000, the fourth halving (20 April 2024)
  6. mempool.spaceBlock 630,000, the third halving (11 May 2020)
  7. Bitcoin ForumLaszlo Hanyecz, "Pizza for bitcoins?" (report of the trade, 22 May 2010)
  8. mempool.spaceBlock 420,000, the second halving (9 July 2016)
  9. Bitcoin BIPsBIP 141: Segregated Witness (consensus layer)
  10. mempool.spaceBlock 481,824, SegWit activation (24 August 2017)
  11. Satoshi NakamotoBitcoin: A Peer-to-Peer Electronic Cash System (white paper, 31 October 2008, PDF)
  12. Cryptography mailing listSatoshi Nakamoto, "Bitcoin P2P e-cash paper", 31 October 2008
  13. Bitcoin BIPsBIP 341: Taproot, SegWit version 1 spending rules
  14. mempool.spaceBlock 709,632, Taproot activation (14 November 2021)
  15. mempool.spaceBlock 210,000, the first halving (28 November 2012)
  16. Bitcoin Coresrc/validation.cpp: GetBlockSubsidy, 50 BTC halved every 210,000 blocks
  17. mempool.spaceREST API documentation: block height, hash rate, difficulty adjustment and fee estimates
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Education, not advice.

This is general information and education only. It is not financial, investment, tax, accounting, legal or regulatory advice, and it is not a recommendation to buy, sell or hold bitcoin or any other asset. It does not take account of your circumstances or those of your company. You must obtain your own official professional advice to confirm this information is correct before acting on it.

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