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Bitcoin

Cryptocurrency
Bitcoin is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight. Wikipedia
Symbols: BTC, ฿, and ₿
Block reward: ₿6.25 (as of 2023)
Code: BTC
Exchange rate: Floating
Hash function: SHA-256 (two rounds)
Implementation(s): Bitcoin Core
Initial release: 0.1.0 / 9 January 2009 (15 years ago)