Halving day 2012

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Halving day 2012 (November 28, 2012) was the day of the first subsidy halving, which occurred when block 210000 was solved. Until block 420000, the block reward would be 25 BTC instead of the original 50 BTC.

At the moment before the halving, 10,500,000 BTC had been mined, 50% of the target cap.


A Radeon HD 5800 Series graphics card, the same series of the GPU used to solve block 210000
Block 210000 was found and broadcast on 2012-11-28 at 15:24:38 UTC.[1] Slush's pool was responsible for finding the solution,[2] and a miner named laughingbear contributed the solution.[3]

The block was solved by a Radeon HD 5800[4] after mining for less than a week.[5] This GPU would later be sold to Chaang Noi at a significant markup on August 26, 2013.[6] Several images of the card were posted to Bitmit, but no copies are currently known to exist.[7]


  1. Block 210000. Main chain. 2012-11-28. Hash 000000000000048b95347e83192f69cf0366076336c639f9b7228e9ba171342e. Block explorer
  2. BitcoinTalk thread 128200. 210000 block found 28 November 2012.
  3. BitcoinTalk thread 1976. [2500 GH/s] Slush's Pool (mining.bitcoin.cz); TX FEES + Stratum 27 November 2010.
  4. BitcoinTalk thread 128200. 210000 block found 28 November 2012. Post 1364739.
  5. BitcoinTalk thread 128221. Block 210000 found 28 November 2012.
  6. BitcoinTalk thread 168342. [SOLD] A piece of Bitcoin history. Video card that found Block 210000 5 April 2013.
  7. BitcoinTalk thread 1138466. Looking for a certain image 29 July 2015.

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