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1 BTC = 0.003 USD





Bitcoin uses peer-to-peer technology to operate with no central authority or banks; managing transactions and the issuing of bitcoins is carried out collectively by the network.




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Circulating Supply

Created with Highstock 6.1.1 Circulation Release:81.5% Circulation Release:81.5% Others:18.5% Others:18.5%

Rules of circulation release Supply

New bitcoins are generated by the network through the process of "mining". In a process that is similar to a continuous raffle draw, mining nodes on the network are awarded bitcoins each time they find the solution to a certain mathematical problem (and thereby create a new block). Creating a block is a proof of work with a difficulty that varies with the overall strength of the network. The reward for solving a block is automatically adjusted so that, ideally, every four years of operation of the Bitcoin network, half the amount of bitcoins created in the prior 4 years are created. A maximum of 10,499,889.80231183 bitcoins were created in the first 4 (approx.) years from January 2009 to November 2012. Every four years thereafter this amount halves, so it should be 5,250,000 over years 4-8, 2,625,000 over years 8-12, and so on. Thus the total number of bitcoins in existence can never exceed 20,999,839.77085749 and counting. See Controlled Currency Supply. Blocks are mined every 10 minutes, on average and for the first four years (210,000 blocks) each block included 50 new bitcoins. As the amount of processing power directed at mining changes, the difficulty of creating new bitcoins changes. This difficulty factor is calculated every 2016 blocks and is based upon the time taken to generate the previous 2016 blocks. Eventually the reward will go from 0.00000001 BTC to zero and no more bitcoins will be created. The block reward calculation is done as a right bitwise shift of a 64-bit signed integer, which means it is divided by two and rounded down. The integer is equal to the value in BTC * 100,000,000 since internally in the reference client software, all Bitcoin balances and values are stored as unsigned integers. With an initial block reward of 50 BTC, it will take many 4-year periods for the block reward to reach zero. The last block that will generate coins will be block #6,929,999 which should be generated at or near the year 2140. The total number of coins in circulation will then remain static at 20,999,999.9769 BTC. Even if the allowed precision is expanded from the current 8 decimals, the total BTC in circulation will always be slightly below 21 million (assuming everything else stays the same). For example, with 16 decimals of precision, the end total would be 20,999,999.999999999496 BTC.

Miner Calculate

Created with Highstock 6.1.1 Poolin AntPool BTC.TOP SlushPool F2Pool ViaBTC unknown BitFury Huobi.pool DPOOL WAYI.CN Others

Project Introduction


Commerce on the Internet has come to rely almost exclusively on financial institutions serving as trusted third parties to process electronic payments.  While the system works well enough for most transactions, it still suffers from the inherent weaknesses of the trust based model. Completely non-reversible transactions are not really possible, since financial institutions cannot avoid mediating disputes.  The cost of mediation increases transaction costs, limiting the minimum practical transaction size and cutting off the possibility for small casual transactions, and there is a broader cost in the loss of ability to make non-reversible payments for nonreversible services.  With the possibility of reversal, the need for trust spreads.  Merchants must be wary of their customers, hassling them for more information than they would otherwise need. A certain percentage of fraud is accepted as unavoidable.  These costs and payment uncertainties can be avoided in person by using physical currency, but no mechanism exists to make payments over a communications channel without a trusted party. What is needed is an electronic payment system based on cryptographic proof instead of trust, allowing any two willing parties to transact directly with each other without the need for a trusted third party.  Transactions that are computationally impractical to reverse would protect sellers from fraud, and routine escrow mechanisms could easily be implemented to protect buyers.  In this paper, we propose a solution to the double-spending problem using a peer-to-peer distributed timestamp server to generate computational proof of the chronological order of transactions.  The system is secure as long as honest nodes collectively control more CPU power than any cooperating group of attacker nodes.

Who created Bitcoin?

Bitcoin is the first implementation of a concept called "cryptocurrency", which was first described in 1998 by Wei Dai on the cypherpunks mailing list, suggesting the idea of a new form of money that uses cryptography to control its creation and transactions, rather than a central authority. The first Bitcoin specification and proof of concept was published in 2009 in a cryptography mailing list by Satoshi Nakamoto. Satoshi left the project in late 2010 without revealing much about himself. The community has since grown exponentially with many developers working on Bitcoin.

Satoshi's anonymity often raised unjustified concerns, many of which are linked to misunderstanding of the open-source nature of Bitcoin. The Bitcoin protocol and software are published openly and any developer around the world can review the code or make their own modified version of the Bitcoin software. Just like current developers, Satoshi's influence was limited to the changes he made being adopted by others and therefore he did not control Bitcoin. As such, the identity of Bitcoin's inventor is probably as relevant today as the identity of the person who invented paper.

Advantages of Bitcoin

  • Payment freedom - It is possible to send and receive bitcoins anywhere in the world at any time. No bank holidays. No borders. No bureaucracy. Bitcoin allows its users to be in full control of their money.

  • Choose your own fees - There is no fee to receive bitcoins, and many wallets let you control how large a fee to pay when spending. Higher fees can encourage faster confirmation of your transactions. Fees are unrelated to the amount transferred, so it's possible to send 100,000 bitcoins for the same fee it costs to send 1 bitcoin. Additionally, merchant processors exist to assist merchants in processing transactions, converting bitcoins to fiat currency and depositing funds directly into merchants' bank accounts daily. As these services are based on Bitcoin, they can be offered for much lower fees than with PayPal or credit card networks.

  • Fewer risks for merchants - Bitcoin transactions are secure, irreversible, and do not contain customers’ sensitive or personal information. This protects merchants from losses caused by fraud or fraudulent chargebacks, and there is no need for PCI compliance. Merchants can easily expand to new markets where either credit cards are not available or fraud rates are unacceptably high. The net results are lower fees, larger markets, and fewer administrative costs.

  • Security and control - Bitcoin users are in full control of their transactions; it is impossible for merchants to force unwanted or unnoticed charges as can happen with other payment methods. Bitcoin payments can be made without personal information tied to the transaction. This offers strong protection against identity theft. Bitcoin users can also protect their money with backup and encryption.

  • Transparent and neutral - All information concerning the Bitcoin money supply itself is readily available on the block chain for anybody to verify and use in real-time. No individual or organization can control or manipulate the Bitcoin protocol because it is cryptographically secure. This allows the core of Bitcoin to be trusted for being completely neutral, transparent and predictable.

Can Bitcoin scale to become a major payment network?

The Bitcoin network can already process a much higher number of transactions per second than it does today. It is, however, not entirely ready to scale to the level of major credit card networks. Work is underway to lift current limitations, and future requirements are well known. Since inception, every aspect of the Bitcoin network has been in a continuous process of maturation, optimization, and specialization, and it should be expected to remain that way for some years to come. As traffic grows, more Bitcoin users may use lightweight clients, and full network nodes may become a more specialized service.

Time Line


Bitcoin split BTG and BCH. Cboe has launched Bitcoin futures contracts.


Bitcoin networks have a computational power of more than 1EH/S; A new wave of the block supply halved.


Coinbase exchange opened, and the first regulated Bitcoin exchange in the United States went online. An estimated 160,000 merchants accept Bitcoin payments.


The computing power of Bitcoin network reaches 100PH/S. The HMRC classifies Bitcoin as an asset or private fund, meaning there is no VAT on its mining or exchange. The U.S. government has auctioned more than 29,000 Bitcoins confiscated from the silk road, indicating that Bitcoin is no longer considered as an illegal currency. Conducting the first Bitcoin derivatives transaction. Microsoft, Dell etc. accept Bitcoin payments.


There is a bifurcation problem. The first Bitcoin ATM was born. The first Bitcoin theft. FINCEN has released the world's first virtual currency regulation. Germany recognizes Bitcoin's legal status. China issued the notice on preventing the risks of Bitcoin, clear Bitcoin has no legal status equivalent to real currency.


The block supply was halved for the first time


Bitcoin funds were created


The official version of 0.3.21, which has a history, came online, with support for new features such as UPNP and satoshi unit, as the Bitcoin system matured.


The world's first ore pool, Slush's pool, first dug successfully; Satoshi Nakamoto retired and transferred development rights to Gavin Andersen, an American. 


Attackers used integer overflow vulnerabilities to create 1840 billion Bitcoins out of thin air


MT.GOX, the world's first Bitcoin exchange, was founded in Tokyo


The first Bitcoin transaction took place


The first Bitcoin block, called Genesis, was launched, and Satoshi Nakamoto obtained the first 50 Bitcoins through mining, marking the beginning of the Bitcoin network and the official birth of Bitcoin.


Satoshi Nakamoto published Bitcoin's creation paper, Bitcoin: a peer-to-peer cash payment system.


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Team Members

Satoshi Nakamoto


Wladimir J. van der Laan

Chief Maintainer of the Bitcoin Repository

Matt Corallo

Bitcoin Core Developer

Gavin Andresen

Former Chief Developer of Bitcoin & Founder of the Cupid Foundation