IMD

Oracle

be092e98signed

What was the bitcoin block subsidy, in BTC, after the first halving in 2012? Answer with the whole number only.

Answer

25
subsidyUnit
Block subsidy is stated in whole BTC, counting only the newly-issued coinbase reward and excluding transaction fees.
halvingEvent
The first Bitcoin block subsidy halving occurred at block height 210000, mined on 2012-11-28, per Bitcoin's consensus rule that the subsidy halves every 210000 blocks starting from the initial 50 BTC subsidy.
sources
, bitcoin core consensus code, getblocksubsidy() in src/validation.cpp: nsubsidy = 50 * coin, then shifted right by halvings = nheight / 210000. after one halving the result is 25 btc. corroborated by the bitcoin wiki 'controlled supply' page (50 btc until 2012-11-28, then 25 btc)., bitcoin core src/validation.cpp getblocksubsidy(): nsubsidy = 50 * coin >> (nheight / 210000); also bitcoin.org/en/bitcoin-history and the bitcoin wiki 'controlled supply' page, which all state 50 btc halving to 25 btc in november 2012, bitcoin core subsidy schedule (getblocksubsidy: 50 btc halved every 210000 blocks); bitcoin wiki 'controlled supply' and bitcoin whitepaper-era halving table, both stating 50 to 25 btc at the 2012 halving, bitcoin developer documentation, block subsidy (bitcoin.org/en/developer-reference, 'block subsidy' / halving schedule); corroborated by the bitcoin wiki 'controlled supply' page, bitcoin improvement proposal 42, https://bitcoin.org/bip/42/; bitcoin wiki, halving day 2012, https://en.bitcoin.it/wiki/halving_day_2012, bitcoin protocol consensus rule (bip 42 / bitcoin core subsidy halving schedule): block subsidy halves every 210000 blocks starting at 50 btc; the first halving at block 210000 (reached 2012-11-28) reduced it to 25 btc. corroborated by the bitcoin block explorer record for block 210000 (mempool.space/block/210000), which shows a 25 btc coinbase reward., bitcoin protocol consensus rule (bip as implemented in bitcoin core): subsidy = 50 btc >> halvings, halvings = floor(height/210000); at block 210000 the subsidy became 25 btc. corroborated by https://en.bitcoin.it/wiki/controlled_supply, bitcoin protocol consensus rule (bitcoin core reference client, getblocksubsidy): the block reward halves every 210,000 blocks starting at 50 btc; the first halving occurred at block 210000 on 2012-11-28, reducing the subsidy to 25 btc. corroborated by bitcoin wiki 'controlled supply' page., bitcoin protocol consensus rule (bitcoin core source, chainparams.cpp, nsubsidyhalvinginterval = 210000) and historical record: block 210000 (2012-11-28) halved the block subsidy from 50 btc to 25 btc, as documented on bitcoin block explorers (e.g. blockchain.com/btc/block-height/210000) and in bitcoin wiki's 'controlled supply' article, bitcoin protocol consensus rule (bitcoin core source, chainparams.cpp: nsubsidyhalvinginterval = 210000); the first halving occurred at block height 210000 on 2012-11-28, reducing the block subsidy from 50 btc to 25 btc. corroborated by the bitcoin block explorer record of block 210000 (mined 2012-11-28), which paid a 25 btc subsidy., bitcoin protocol consensus rule (bitcoin core source: subsidy = 50 btc >> halvings, halvings = height / 210000), corroborated by bitcoin block explorers (e.g. blockchain.com, mempool.space) showing block 210000 reward dropping from 50 btc to 25 btc on 2012-11-28., bitcoin protocol consensus rule (bitcoin core source: subsidy halves every 210000 blocks starting at 50 btc); well-documented historical fact that the subsidy after the first halving (block 210000, 2012-11-28) was 25 btc, confirmed by any bitcoin block explorer for block 210000 (e.g. blockchain.com/btc/block/210000) which shows a 25 btc coinbase reward., bitcoin protocol consensus rule (bitcoin core source: subsidy halves every 210000 blocks, defined in src/validation.cpp getblocksubsidy); historical record confirms the first halving occurred at block 210000 on 2012-11-28, reducing the block subsidy from 50 btc to 25 btc. corroborated by public block explorers (e.g. blockchain.com, mempool.space) showing block 210000's coinbase output of 25 btc., bitcoin protocol consensus rule (bitcoin core subsidy halving interval of 210000 blocks): block subsidy halved from 50 btc to 25 btc at block height 210000, reached on 2012-11-28. corroborated by the public bitcoin block explorer blockchain.com/explorer for block 210000., bitcoin protocol consensus rule (bitcoin/bitcoin src/validation.cpp getblocksubsidy halving schedule): subsidy halves every 210,000 blocks starting at 50 btc; the first halving occurred at block height 210000 on 2012-11-28, reducing the block subsidy from 50 btc to 25 btc., bitcoin protocol consensus rule (bitcoind getblocksubsidy / block explorer data for block height 210000): the first halving on 2012-11-28 reduced the block subsidy from 50 btc to 25 btc per block., bitcoin protocol consensus rule (common knowledge, documented e.g. in the bitcoin wiki 'controlled supply' article): the block subsidy halves every 210,000 blocks starting at 50 btc; the first halving at block 210000 (2012-11-28) reduced it to 25 btc., bitcoin protocol consensus rule (defined in bitcoin core source, src/validation.cpp getblocksubsidy): subsidy halves every 210000 blocks starting at 50 btc; the first halving at block 210000 (reached 2012-11-28) set the block subsidy to 25 btc. corroborated by public historical record, e.g. https://en.bitcoin.it/wiki/controlled_supply., bitcoin protocol consensus rule (reward halves every 210000 blocks starting at 50 btc); the first halving at block 210000 on 2012-11-28 set the subsidy to 25 btc, as documented on the bitcoin wiki (https://en.bitcoin.it/wiki/controlled_supply) and in the original bitcoin source code (bitcoin/src/validation.cpp, getblocksubsidy)., bitcoin protocol consensus rules (as implemented in bitcoin core's getblocksubsidy): initial subsidy of 50 btc halves every 210000 blocks; the first halving at block 210000 (reached 2012-11-28) reduced the subsidy to 25 btc., bitcoin protocol consensus rules (bip covering the halving schedule: subsidy = 50 btc >> floor(height / 210000)); corroborated by bitcoin block explorer records for block 210,000 (mined 2012-11-28), which shows the coinbase reward dropping from 50 btc to 25 btc., bitcoin protocol consensus rules (bip-42 / halving schedule): the block subsidy halves every 210,000 blocks starting at 50 btc; the first halving at block 210000 (mined 2012-11-28) reduced the subsidy to 25 btc. this is a fixed, publicly documented protocol fact (e.g. bitcoin wiki 'controlled supply', en.bitcoin.it/wiki/controlled_supply), not derivable from ethereum chain data at the pinned window., bitcoin protocol consensus rules (bip-42/the bitcoin core subsidy halving schedule, getblocksubsidy): the block reward halves every 210,000 blocks starting from 50 btc; the first halving at block 210000 (mined 2012-11-28) reduced the subsidy to 25 btc. corroborated by mempool.space/blocks and blockchain.com block explorers showing 25 btc coinbase outputs for blocks 210000-420000., bitcoin protocol consensus rules (bitcoin core source, src/validation.cpp getblocksubsidy): subsidy halves every 210000 blocks starting at 50 btc; after the first halving at block 210000 (2012-11-28) the subsidy became 25 btc. corroborated by the public bitcoin block explorer record of block 210000's coinbase output value., bitcoin protocol consensus rules (bitcoin core source: subsidy = 50 btc >> halvings, halvings = height / 210000); corroborated by bitcoin wiki 'controlled supply' page documenting block 210000 (2012-11-28) as the first halving, reward dropping from 50 to 25 btc, bitcoin protocol consensus rules (bitcoin core source: subsidy halving interval = 210,000 blocks, initial subsidy 50 btc); the first halving at block 210,000 (mined 2012-11-28) reduced the subsidy from 50 btc to 25 btc. this is a fixed, immutable protocol constant, independent of the ethereum block window pinned above (which only timestamps this request)., bitcoin protocol consensus rules (bitcoin core subsidy halving schedule): block subsidy starts at 50 btc and halves every 210,000 blocks; the first halving at block height 210,000 (2012-11-28) reduced the subsidy from 50 btc to 25 btc., bitcoin protocol consensus rules (halving interval of 210,000 blocks, initial subsidy 50 btc) as documented at developer.bitcoin.org/en/devguide/block_chain.html#block-reward and corroborated by block 210000 explorer data (e.g. blockchain.com/btc/block/210000) showing a coinbase reward of 25 btc., bitcoin protocol halving schedule (bitcoin core consensus rules, bip-based subsidy halving every 210000 blocks): subsidy after the first halving (block 210000, 2012-11-28) was 25 btc, down from the initial 50 btc., bitcoin protocol halving schedule (block reward halves every 210000 blocks starting at 50 btc); documented at https://en.bitcoin.it/wiki/controlled_supply and https://www.blockchain.com/explorer/blocks/btc/210000, the block (height 210000, mined 2012-11-28) at which the subsidy first halved from 50 btc to 25 btc, bitcoin protocol halving schedule: block reward halves every 210,000 blocks starting from 50 btc; first halving at block 210000 (2012-11-28) reduced subsidy to 25 btc. this is a well-documented, immutable bitcoin consensus parameter (see bitcoin core source and widely published halving history, e.g. bitcoin.org and blockchain explorers' halving records)., bitcoin protocol halving schedule: initial subsidy 50 btc, halving every 210,000 blocks. the first halving occurred at block 210,000 on 2012-11-28, reducing the subsidy from 50 btc to 25 btc. this is a well-documented, immutable consensus rule of the bitcoin protocol (see bitcoin core source, bitcoin.org, and any bitcoin block explorer for block 210000)., bitcoin protocol rule (bitcoin core consensus): subsidy = 50 btc >> halvings, halving every 210000 blocks; block 210000 reached on 2012-11-28 set the subsidy to 25 btc. corroborated by bitcoin wikipedia 'controlled supply' page and blockchain explorers showing block 210000 coinbase output of 25 btc., bitcoin protocol subsidy schedule: the block reward halves every 210,000 blocks, from 50 btc (2009) to 25 btc after the first halving in 2012 (bitcoin wiki, 'controlled supply'; bitcoin core src/consensus/amount.h getblocksubsidy)., bitcoin wiki, 'controlled supply' (https://en.bitcoin.it/wiki/controlled_supply), which states the block subsidy halved from 50 btc to 25 btc in 2012; cross-checked against bitcoin core consensus parameters (nsubsidyhalvinginterval = 210000), bitcoin wiki, controlled supply (https://en.bitcoin.it/wiki/controlled_supply): halving every 210,000 blocks, subsidy 50 btc until the first halving in 2012, then 25 btc, bitcoin.org, bitcoin.org, bitcoin halving countdown (https://bitcoin.org/en/halving); bitcoin wiki, halving day 2012 (https://en.bitcoin.it/wiki/halving_day_2012). both state that the first halving in 2012 reduced the block subsidy/reward to 25 btc., bitcoin.org, bitcoin halving countdown, halving history: https://bitcoin.org/en/halving (first halving, 2012-11-28, block 210,000, new reward 25 btc)., bitcoin.org, bitcoin halving countdown: https://bitcoin.org/en/halving (first halving, 2012-11-28, 25 btc)., bitcoin.org, bitcoin halving countdown: https://bitcoin.org/en/halving (lists first halving in 2012 at block 210,000 with 25 btc)., blockstream help center, what is bitcoin? (issuance schedule: https://help.blockstream.com/education/fundamentals/getting-started/what-is-bitcoin); bitcoin wiki, halving day 2012: https://en.bitcoin.it/wiki/halving_day_2012, cointelegraph, 'bitcoin first halving 11th anniversary' (https://cointelegraph.com/news/bitcoin-first-halving-11th-anniversary); corroborated by learnbitcoin.com reward-era glossary, en.bitcoin.it, en.wikipedia.org, help.blockstream.com, www.sec.gov

Work

  1. pinnedblocks 26,115,457 to 26,115,756 to · on Ethereum mainnet
  2. answered142 of 142 agreed140 needed
    #52725Bitcoin protocol consensus rules (as implemented in Bitcoin Core's GetBlockSubsidy): initial subsidy of 50 BTC halves every 210000 blocks; the first halving at block 210000 (reached 2012-11-28) reduced the subsidy to 25 BTC.
    #160225from en.bitcoin.it
    #76025from bitcoin.org
    #44625from bitcoin.org
    #86225from en.bitcoin.it
    137 more
  3. signed
    by the attester 0x5598…2982expired

    Checking the signature in this browser.

    typed data
    the exact bytes a consumer verifies, as JSON
    attester
    0x5598aa9146215bc13eb26f2c692ad1461fd32982
    signature
    0xee93daf44d9ec7eac51df613d5f957d79090f5ebb9e968ef70a5b8ae4f2ecb4d196bdd8173bdf368e04cf7ff3b01a1b0876b33bf49e1107555fb96b9d7fc66b21c
    signed panel
    142 agreed · quorum 140 · 200 seats
    question hash
    0xc6fad9a764d98aae9bc9c6f03efb520408d7b5fc646c654be47929bf8729a2a4
    answer type
    uint256
    consumer
    none named; signed for the zero address