Blockchain qtum

1.

blockchain includes public blockchain, joint (instry) blockchain and private blockchain. Public chain point-to-point e-cash system: bitcoin, smart contract and decentralized application platform: Ethereum

blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies

blockchain is an important concept of bitcoin. In essence, it is a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of bitcoin network transaction information, Used to verify the validity of its information (anti-counterfeiting) and generate the next block

extended data

according to the different degree of blockchain network centralization, three kinds of blockchains under different application scenarios are differentiated:

1. The blockchain with the whole network open and without user authorization mechanism is called public chain

2. The authorized nodes are allowed to join the network, and the information can be viewed according to the authority. It is often used in the inter agency blockchain, which is called alliance chain or instry chain

3. All the nodes in the network are in the hands of one organization, which is called private chain

alliance chain and private chain are also called licensing chain, and public chain is called non licensing chain

blockchain features

1, decentralization. Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain

2. Openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent

3. Independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention

4. Safety. As long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily manipulated and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes

5. Anonymity. Unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and the information can be transferred anonymously

2. Xiaoyi blockchain, laikelib and many others seem to be very successful.

3. It's hard to say that many of these so-called blockchain companies just raise funds and then run away. The big guys with inside information all know in advance.

4. Bitcoin in China

5. Chbt China bitcoin website https://www.chbtc.com/ , which will open at 14:30 on August 8, 2017

6.

Get qtum node

you can get qtum node program through one of the following four methods:

1. Download binary files directly

if you don't care about the source code of qtum, the most convenient way to deploy qtum node is to download the latest binary files from qtum release page (click to open). Currently supported platforms include Linux, windows and OSX. It is recommended to download the latest version. This tutorial takes the latest version of v0.14.13 as an example

(note that the version number of the latest version you see may be different, such as 0.14.13, other strings remain unchanged)

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for Mac users, please download: qtum-0.14.13-osx64.tar.gz

for Linux users, please download: qtum-0.14.13-i686-pc-linux-gnu.tar.gz (32-bit) or qtum-0.14.13-x86_ 64-linux-gnu.tar.gz (64 bit)

for Windows users, please download: qtum-0.14.13-win32.zip (32 bit) or qtum-0.14.13-win64.zip (64 bit)

for raspberry pie users, please download: qtum-0.14.13-arm-linux-gnueabihf.tar.gz

after the compressed package is decompressed, & lt; Decompression path & gt/ Bin / contains qtumd and qtum cli, which are the qtum node executable files to be used in this tutorial

7. The hierarchical structure of blockchain
1, data layer / data layer
the data layer mainly describes the physical form of blockchain, which is a chain structure starting from Genesis block on blockchain, including block data, chain structure, random number, time stamp, public and private key data on blockchain, and is the lowest level data structure in the whole blockchain technology
2. Network layer / network layer
the network layer mainly realizes the mechanism of distributed network through P2P technology, and the network layer includes P2P networking mechanism, data dissemination mechanism and data verification mechanism. Therefore, blockchain is essentially a P2P network with automatic networking mechanism, and the communication between nodes is maintained by maintaining a common blockchain structure
3. Consensus layer / consensus layer
consensus layer mainly includes consensus algorithm and consensus mechanism, which enables highly dispersed nodes to reach consensus on the effectiveness of block data efficiently in the decentralized blockchain network. It is one of the core technologies of blockchain and also the governance mechanism of blockchain community. At present, there are at least dozens of consensus mechanism algorithms, including workload proof, rights and interests proof, rights and interests authorization proof, burning proof, importance proof and so on
data layer, network layer and consensus layer are the necessary elements of building blockchain technology. Without any layer, it can not be called a real blockchain technology
4. Incentive layer / activator layer
the incentive layer mainly includes the issuing system and distribution system of economic incentive. Its function is to provide certain incentive measures, encourage nodes to participate in the security verification work in the blockchain, incorporate economic factors into the blockchain technology system, encourage nodes that comply with rules to participate in bookkeeping, and punish nodes that do not comply with rules
5. Contract layer / contract layer
the contract layer mainly includes various scripts, codes, algorithm mechanisms and smart contracts, which is the basis of block chain programming. Embedding the code into the blockchain or token, realizing the smart contract that can be customized, and automatically executing without a third party when certain constraints are met, is the foundation of the blockchain's distrust
6. Application layer / application layer
the application layer of blockchain encapsulates various application scenarios and cases, which are similar to applications on computer operating system, portals on Internet browsers, search engines, e-malls or apps on mobile phones. The blockchain technology applications are deployed on Ethereum, EOS and qtum, and are implemented in real life scenarios. The future programmable finance and programmable society will also be built on the application layer
incentive layer, contract layer and application layer are not necessary factors for each blockchain application, and some blockchain applications do not completely include the three-tier structure.

8.
investment in bitcoin is not so profitable now. All the financial procts I know belong to usury, and those with an annual rate of more than 24% are generally not protected by the state. As far as I know, the monthly profit of 30% are all pyramid schemes, such as BBT mint
of course, maybe you will refute me, because you do get the benefits, but if you don't get the benefits, will you invest more money, or will you pull the head? This can go to the network about the Ponzi scheme.

9. The controversial coin is well-known blockchain
buy quantum chain (quantum coin) qtum