process to write dead or randomly generated parameters into the JSON file, that is, the above fileCreate the core code of the account: (Accounts.keystore.keystore_passphrase.go)The Encryptkey method inFuncencryptkey (Key key,authstring,scryptn,scryptpint) ([]byte,error)Where key is an encrypted account, including ID, public private key, addressAuth is the password entered by the userSCRYPTN, is the n in the scrypt algorithmP in the Scryptp,scrypt algorithmDerivedkey, err: = Scrypt. Key (Autharr
block chain/distributed ledger technology vendors and products/projectsVendors and products/projects of Blockchain/distributed Ledger Technologies
main programming language Major programming Languages
source code repository source repositories
IBM Openblockchain (OBC)
Go (Golang)
https://github.com/openblockchain/
Ethereum (ether Square)
C + +, go (Golang)
Https://github.com/ethereum Https://github.com/e
Since the last few weeks to publish the blockchain exam, many people ask Elwin standard answer, I here to provide my answer, provide reference for everyone.
If you have different answers, please leave a message or tweet to me (Weibo.com/elwingao) for discussion.
level Two exam reference answer
First, single choice1D 2A 3 a 4C 5B 6BSecond, non-problem1, N2, N3, Y4, N5, N6, Y7, N8, N9, N10, NIii. Multiple choice of topics1, A,b,d2, B,c3, A,b,d4, A,
collection of name and LINKS,IPFS.
For small files (
For large files, it is represented as a collection of file blocks (
Directory structure: A directory is a IPFs object with no data, and its links to the files and directories it contains.
IPFs can represent the data structure that Git uses, and Git commits object. The main feature of Commit object is that he has one or more links called ' parent0 ' and ' parent1 ' (these links point to the previous version), and an object (which becomes
Blockchain Enthusiast (qq:53016353)
The previous analysis program looked at the details of the analysis, so without the concept of framework, took two days to analyze the Hyperledger fabric architecture design, analysis of the program does not reference any information, such as error welcome correction, common progress. The author has the following questions before the detailed analysis procedure:1) How the CLI (command line) client sends a command to
that he has one or more links called ' parent0 ' and ' parent1 ' (these links point to the previous version), and an object (which becomes a tree in git). Point to the file system structure that references this commit.
5, bitcoin and ethereum[12][13]
The earliest application of Merkle proof was bitcoin, which was described and created by the Nakamoto in 2009. Bitcoin's blockchain uses Merkle proofs to store transactions for each chunk.
The benefi
Blockchain Enthusiast (qq:53016353)
As the core concept of Bitcoin, digital currency (data chunks, data blocks, data block chains) plays an important role in understanding the structure of Bitcoin. In what is data chunks, the editor simply introduces the concept of data chunks from the point of view of distributed transaction records in data chunks. Today, the editor analyzes the details of what is being recorded in the data block from the program str
Blockchain Enthusiast (qq:53016353)
The virtual currency of the handed down block first to confirm whether your founder ID is already in the btsx of the creation block. BTSX client in the Select Directory--register, and then enter your initiation ID, if you see in the list and the right side display Genesis words, the description has been successfully included in the Genesis block. You can also find (5MB) in the following file, note that if your found
: Network Disk DownloadDevelopers. This book covers all aspects of the front-end, background, both front-end developers, or background developers can learn the reference.Architect. The blockchain itself is a model of distributed, cloud computing, and this book describes in detail the architecture of a blockchain product that can be used to learn how blockchain is
there's a file that's transferred from A to B. b First obtain the trusted file Merkle tree, when the file is downloaded, b through the Merkle tree root node and the obtained root node comparison, if not consistent, through the structure of the binary tree can be quickly located in the log (N) complexity of the data block error. Replica Synchronization
All the machines in a cluster need to keep the data in sync, and if the data is inconsistent, you need to quickly locate the inconsistent nodes.
The consensus mechanism is the core of the distributed system, in which the mutual distrust node finally achieves the consistency of the data through the presupposition mechanism called the consensus. The consensus mechanism is the approach to be adopted in order to achieve this consensus.Objective of the consensus mechanism: consistency: All honest nodes are saved with the same chunk-chain prefixes. Validity: Messages posted by an honest node will eventually be recorded in their
Blockchain Enthusiast (qq:53016353)
Betting consensus
Casper introduced a fundamentally new concept to the open economic consensus as its foundation: betting consensus. The core idea of a betting consensus is simple: provide the validator with an opportunity to bet which block will be finalized for the verification person. The betting on a block x here is a deal, in all chunks of the world where X is processed, the reward is given to the authenticat
In my study of Ethereum technology, because of less relevant information, so took more detours. So here we will not introduce the grammatical structure of solidity, but will be in the next stage, from the actual combat, in succession to introduce Geth, browser-solidity, mist these three tools, and in the process of constantly explaining the basic concept of ethereum.
Through the practical use of these tools, as well as the basic concept of ethereum to deepen understanding, for the second stage o
Blockchain Enthusiast (qq:53016353)
1. Download and run the Smart contract client. Smart Contract D is a process that runs in the background and is responsible for all functions. Smart contract C is a command-line tool that pushes commands to smart contract D. After the download is complete, the smart contract places all the files in one folder. Smart Contract D will create the relevant folder for the user database under this folder. After the
blockchain, sent her a dress, is distributed ledger.Password currency is the daughter of blockchain and money science. However, since the beginning of the blockchain no one is optimistic, the money science is a noble, they just on the time also dare not open, also did not receive a certificate, the birth of the password currency, has been incognito. The little g
In this article, the authors describe three Java projects that use block chains, and where each project applies, for developers to choose from their own needs. The following is the translation:
You should all have heard of Bitcoin, Ethernet, or other encrypted currencies, which often appear in the news, but as Java developers, do you know how to easily interact with blockchain technology? The following are three major Java projects that can take advan
call originated.
This means that a contract can dynamically load code from another address at run time. Store, both the current address and the balance point to the contract that originated the call, and only the code is fetched from the called address.
This allows the solidity to implement "libraries". Reusable library code can be applied to the storage of a contract and can be used to implement complex data structures.
Log (Logs)
At the block level, data can be stored in a sp
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