Blockchain Learning Note 2

1, private chain. Digital Asset group (DAH) mainly solves the problem of internal liquidation efficiency.
2. Alliance chain. The R3 alliance mainly solves the problem that the efficiency of inter-bank liquidation is too low.
3. Problems faced by blockchain development. (1) Security, the new blockchain system does not have a large number of trusted nodes. (2) There is no unified standard, the problem of trust between the partners. (3) Regulatory issues, blockchain has the characteristics of privacy protection, then the legitimacy of the transaction is regulated and difficult to trace. (4) Technical issues, as a global payment system, are far less efficient than the actual requirements of global trade. The Bitcoin network currently confirms a maximum of 7 transactions per second, compared to the fastest 10,000 transactions per second for Visa's network system, and the Alipay record is 2014 singles per second, 80,000 strokes. (Side chain and lightning network are solving this problem)
4. The main form of the blockchain and the direction of application for each type. Shared chain: Any individual or group in the world can send a transaction, and a transaction can obtain an effective confirmation of that blockchain, and anyone can participate in its consensus process. Private chain: Only use the Blockchain's general ledger technology for accounting, can be a company, can also be a person, exclusive access to the blockchain write permissions, this chain and other distributed storage scheme is not much different. Union chain: By a group of designated multiple pre-selected nodes for the bookkeeper, each block is generated by all the pre-selection node (pre-selection node participation in the consensus process), other access nodes can participate in the transaction, but do not ask the accounting process (essentially or managed bookkeeping, just become distributed bookkeeping, the number of preselected nodes, How to determine the bookkeeper of each block becomes the main risk point for the blockchain, and anyone else can qualify the query through the blockchain-open API.
5. Blockchain development abroad.
Domestic development:

Question and thought: 1, how each node confirms its own private property. Private. 2, each transaction update is to create a new block, the new block will be added to the tail of the chain. Then the entire data chain will grow larger and bigger, where they are stored. Distributed storage.