What are the technical difficulties of blockchain

1. blockchain technology is the underlying technology derived from big data, like a database recording all relevant important data. According to the research of jinwowo group, the characteristics of blockchain technology are as follows:
1-decentralization
2-transparency
3 - openness
4-autonomy
5 - information cannot be tampered with
6 - anonymity.

2. Renren blockchain enterprise services, visual display, analysis, statistics, monitoring blockchain operation

analysis, statistics, monitoring and alarm of the overall running state of the system

visualization analysis, statistics and management of member organizations, nodes and account books

digital asset transaction into the chain, transaction information, block height query display, etc

at present, there are not many such companies. Because of the particularity of blockchain, only indivial companies in China can do it, not necessarily big companies, but only those who have really done blockchain landing projects, such as Renren chain.

3. Blockchain solves the problem of trust, which is the root of all problems
wikilink is a complete intelligent contract platform supporting Turing. Wikilink adopts the consensus mechanism of dpos, with a total of 11 voting nodes, generating a new block every 10 seconds. Through the smart contract wikilink, we can realize a wealth of application scenarios, such as asset issuance, guessing applications, right traceability, mutual insurance, decentralized exchanges, cross-border settlement, etc
but the most important thing in these scenarios is trust, which is to be open and transparent.

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5. Explain blockchain with scientific language --- blockchain is a permanent and irreversible modified record generated by superimposing encrypted data (blocks) in chronological order. Many financial institutions in the world, including JPMorgan Chase, HSBC, Citibank and New York Mellon bank, have also cooperated with blockchain companies to study the application of blockchain technology in the financial market. The person in charge of the blockchain Technology Laboratory of Shanghai Heshu software said that when there is no trusted third party in blockchain, all transaction data will be stored in a data block, and the transaction information will form a complete chain and be included in the blockchain, which is a more reliable ultimate solution than the trusted third party.

6. What visa? The general visa center does not provide the service to check the progress. If it is a French visa, you can check the progress on the website where you fill in the form, including whether you have arrived at the consulate, whether you have started the review and so on. But if it is like Czech, the website will only write whether your visa has arrived or not, or whether you have sent it