$BTC

Plural

Bitcoins

Symbol

₿

(Unicode: U+20BF ₿ BITCOIN SIGN)[1]

Code

BTC

Precision

10−8

Subunits

 1⁄1000

Millibitcoin

 1⁄1000000

Microbitcoin

 1⁄100000000

Satoshi[a][2]

Development

Original author(s)

Satoshi Nakamoto

White paper

"Bitcoin: A Peer-to-Peer Electronic Cash System"

Implementation(s)

Bitcoin Core

Initial release

0.1.0 / 9 January 2009 (15 years ago)

Latest release

28.0 / 4 October 2024 (57 days ago)[3]

Code repository

github.com/bitcoin/bitcoin

Development status

Active

Written in

C++

Source model

Free and open-source software

License

MIT License

Ledger

Ledger start

3 January 2009 (15 years ago)

Timestamping scheme

Proof of work (partial hash inversion)

Hash function

SHA-256 (two rounds)

Issuance schedule

Decentralized (block reward)

Initially ₿50 per block, halved every 210,000 blocks

Block reward

₿3.125 (as of 2024)

Block time

10 minutes

Circulating supply

₿19,591,231 (as of 6 January 2024)

Supply limit

₿21,000,000[b]

A cryptocurrency, a virtual currency designed to act as money and a form of payment outside the control of any one person, group, or entity, and thus removing the need for third-party involvement in financial transactions.

A cryptocurrency, a virtual currency designed to act as money and a form of payment outside the control of any one person, group, or entity, and thus removing the need for third-party involvement in financial transactions.

A cryptocurrency, a virtual currency designed to act as money and a form of payment outside the control of any one person, group, or entity, and thus removing the need for third-party involvement in financial transactions.

A cryptocurrency, a virtual currency designed to act as money and a form of payment outside the control of any one person, group, or entity, and thus removing the need for third-party involvement in financial transactions.

A cryptocurrency, a virtual currency designed to act as money and a form of payment outside the control of any one person, group, or entity, and thus removing the need for third-party involvement in financial transactions.