| Bitcoin
|
| File:Bitcoin logo.svg
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| Commonly used logo of bitcoin
|
| Denominations
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| Plural
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Bitcoins
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| Symbol
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₿ (Unicode: U+20BF ₿ BITCOIN SIGN)
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| Code
|
BTC
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| Precision
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10⁻⁸
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| Subunits
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- Millibitcoin (mBTC)
- 1/1000
- Bit (μBTC)
- 1/100000
- Satoshi (sat)
- 1/10000000
- Millisatoshi (msat)
- 1/100000000000
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| Development
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| Original author
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Satoshi Nakamoto
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| White paper
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Bitcoin: A Peer-to-Peer Electronic Cash System
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| Implementation
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Bitcoin Core
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| Initial release
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0.1.0 / 9 January 2009 (16 years ago)
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| Latest release
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30.0.0 / 11 October 2025 (34 days ago)
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| Code repository
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GitHub
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| Development status
|
Active
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| Written in
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C++
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| Source model
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Free and Open Source Software
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| License
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MIT Licence
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| Ledger
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| Ledger start
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3 January 2009 (16 years ago)
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| Timestamping scheme
|
Proof of work (partial hash inversion)
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| Hash function
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SHA-256 (two rounds)
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| Issuance
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Decentralized (block reward), Initially ₿50 per block, halved every 210,000 blocks
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| Block reward
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₿3.125 (as of 2025)
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| Block time
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10 minutes
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| Circulating supply
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₿19,934,271 (as of 14 October 2025)
|
| Supply limit
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₿21,000,000
|
| Valuation
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| Exchange rate
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Floating
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| Website
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bitcoin.org
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