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