Oracle
How many bitcoins was the block subsidy when bitcoin launched in 2009? Answer with the whole number only.
Answer
50
- unit
- whole bitcoins per block
- block subsidy
- newly created bitcoins in the block, excluding transaction fees
- sources
- bitcoin.org, bitcoin bip 42 states the original payout was 50 btc: https://bitcoin.org/bip/42/ ; cambridge centre for alternative finance, 2025 digital mining industry report, states that bitcoin's block subsidy was 50 btc when launched in 2009: https://www.jbs.cam.ac.uk/wp-content/uploads/2025/04/2025-04-cambridge-digital-mining-industry-report.pdf, bitcoin core / satoshi's original client source (main.cpp, getblockvalue: coin*50 for blocks 0-209999), corroborated by the bitcoin wiki 'controlled supply' article (https://en.bitcoin.it/wiki/controlled_supply)., bitcoin core protocol consensus rules (src/consensus/params / getblocksubsidy): initial block subsidy defined as 50 btc per block, halving every 210,000 blocks; confirmed by bitcoin's genesis block coinbase output of 50 btc mined 2009-01-03., bitcoin core source (src/validation.cpp, getblocksubsidy: initial subsidy = 50 * coin) and the bitcoin whitepaper/genesis block documentation, which fix the original block reward at launch in january 2009 at 50 btc before the first halving at block 210000., bitcoin core source (src/validation.cpp, getblocksubsidy: initial subsidy = 50 * coin, halving every 210000 blocks) and the bitcoin whitepaper / genesis block coinbase transaction, which paid a reward of 50 btc., bitcoin core source and the original bitcoin whitepaper/protocol design (satoshi nakamoto, 2009): the initial block subsidy was fixed at 50 btc per block, halving every 210,000 blocks (bitcoin core src/validation.cpp, getblocksubsidy / halving schedule, coin=100000000 base units * 50)., bitcoin core source code (src/validation.cpp, getblocksubsidy) and bitcoin whitepaper/protocol history: the initial block reward at bitcoin's 2009 launch was 50 btc per block, halving every 210,000 blocks, bitcoin core source code (src/validation.cpp, getblocksubsidy: initial subsidy = 50 * coin before the first halving) and the bitcoin genesis block (block 0, mined 2009-01-03), which paid a 50 btc coinbase reward, bitcoin core source code (src/validation.cpp, getblocksubsidy: initial subsidy = 50 * coin) and the bitcoin genesis block (block 0, mined 2009-01-03), whose coinbase transaction paid a 50 btc subsidy before the first halving at block 210000., bitcoin core source code (src/validation.cpp, getblocksubsidy: initial subsidy = 50 * coin) and the bitcoin wiki 'controlled supply' page, both stating the original block reward was 50 btc from the genesis block until the first halving at block 210,000., bitcoin core source code (src/validation.cpp, getblocksubsidy: initial subsidy = 50 * coin, halving every 210,000 blocks), consistent with the original bitcoin.org/bitcoin.pdf whitepaper and the genesis block coinbase output of 50 btc, bitcoin core source code / original 2009 release (main.cpp getblockvalue, coin * 50) and bitcoin wiki 'controlled supply' page, both stating the initial block subsidy was 50 btc per block until the first halving at block 210000., bitcoin developer guide, block chain reference (https://developer.bitcoin.org/reference/block_chain.html): states that the block subsidy started at 50 bitcoins. cross-checked with bip 42 (https://bitcoin.org/bip/42/), which specifies an original payout of 50 btc., bitcoin developer reference, block chain: https://developer.bitcoin.org/reference/block_chain.html, bitcoin developer reference, block chain: https://developer.bitcoin.org/reference/block_chain.html (states that the block subsidy started at 50 bitcoins)., bitcoin developer reference, block chain: https://developer.bitcoin.org/reference/block_chain.html (states the block subsidy started at 50 bitcoins)., bitcoin developer reference, block chain: https://developer.bitcoin.org/reference/block_chain.html (states the block subsidy started at 50 bitcoins); blockstream help center, why is the bitcoin supply limited?: https://help.blockstream.com/education/economics/bitcoin-economics/why-is-the-bitcoin-supply-limited (states the january 2009 launch reward was 50 bitcoin per block)., bitcoin developer reference, block chain: https://developer.bitcoin.org/reference/block_chain.html (states the subsidy started at 50 bitcoins)., bitcoin protocol consensus rule (bitcoin core source, src/validation.cpp getblocksubsidy: initial subsidy = 50 * coin), as documented on the bitcoin wiki 'controlled supply' page describing the genesis block reward of 50 btc in effect from block 0 (2009-01-03) through block 209999., bitcoin protocol consensus rules (bitcoin core source, consensus/amount.h / main.cpp historical coin*50 constant) and the bitcoin genesis block coinbase transaction, which paid a subsidy of 50 btc, bitcoin protocol consensus rules (bitcoin core src/consensus/amount.h / getblocksubsidy), as implemented since the genesis block mined 2009-01-03: initial block subsidy was 50 btc, halving every 210,000 blocks., bitcoin protocol documentation / bitcoin core source (consensus/params): initial block subsidy was 50 btc per block starting with the genesis block on 2009-01-03, halving every 210,000 blocks., bitcoin source code (src/validation.cpp, getblocksubsidy: subsidy starts at 50 * coin) and the original bitcoin whitepaper/genesis block (block 0, mined jan 3 2009), which set the initial block reward to 50 btc before the first halving at block 210000., bitcoin whitepaper / bitcoin core source (src/validation.cpp, getblocksubsidy): initial block reward was 50 btc per block from the genesis block (january 2009) until the first halving at block 210000., bitcoin whitepaper / source code (bitcoin v0.1, 2009): initial coinbase reward was 50 btc per block, per the halving schedule defined in getblockvalue (src/main.cpp), confirmed by the genesis block coinbase output of 50 btc., bitcoin whitepaper/protocol consensus rules (satoshi nakamoto's reference client, bitcoind getblocktemplate/consensus params): initial block subsidy was 50 btc per block, halving every 210,000 blocks., bitcoin whitepaper/source code and bitcoin genesis block (block 0, mined 2009-01-03): the coinbase transaction output was 50 btc, the initial block subsidy defined in bitcoin core's getblocksubsidy halving schedule (50 btc per block before the first halving at block 210000)., bitcoin.org developer reference, block chain, which states that the block subsidy started at 50 bitcoins: https://developer.bitcoin.org/reference/block_chain.html, bitcoin.org, bip 42: https://bitcoin.org/bip/42/; bitcoin.org developer reference, block chain: https://github.com/bitcoin-dot-org/developer.bitcoin.org/blob/master/reference/block_chain.rst, developer.bitcoin.org, doxygen.bitcoincore.org, en.bitcoin.it, github.com, help.blockstream.com, wikipedia, "bitcoin", infobox issuance schedule: "initially ₿50 per block, halved every 210,000 blocks" (https://en.wikipedia.org/wiki/bitcoin), corroborated by blockchain.com explorer genesis block base reward 50.00 btc, wikipedia, 'bitcoin network' (https://en.wikipedia.org/wiki/bitcoin_network): 'it started at 50 bitcoin, dropped to 25 in late 2012, dropped again to 12.5 on the summer of 2016, and to 6.25 bitcoin in 2020.', www.blockchain.com
Work
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- Answered146 of 146 agreed140 needed#104950from bitcoin.org#150750from developer.bitcoin.org#37850from bitcoin.org#71050from developer.bitcoin.org#6550from developer.bitcoin.org
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- attester
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