Blockchain security testing center established

1. Security in blockchain comes from some attributes< Mining blocks need to use resources< Br > 2. Each block contains the hash value of the previous block< Br > imagine if the attacker wants to change the chain by changing the transaction five blocks ago. If they tamper with the block, the hash value of the block changes. Then the attacker must change the pointer from the next block to the changed block, and then change the hash value of the next block... This will continue until the end of the chain. This means that the farther the block is behind the chain, the greater the resistance to change. In fact, the attacker has to simulate the hash capability of the whole network up to the front end of the chain. However, when the attacker tries to attack, the chain continues to move forward. If the attacker's hash value is lower than the rest of the chain (< 50%), they will always chase and never proce the longest chain. Therefore, this type of blockchain can resist attacks, where the attacker's hash value is less than 50%< Br > when attackers have 51% hash value, they can rewrite the network history with a list of valid transactions. This is because they can recalculate the hash value of any block sort faster than the rest of the network, so they can ultimately guarantee a longer chain. The main danger of 51% attacks is the possibility of double spending. This simply means that an attacker can buy an item and show that they have paid with any number of confirmations on the blockchain. Once they receive the item, they can reorder the blockchain so that it doesn't include the send transaction and get a refund< Br > even if the attacker has more than 50% hash value, the attacker can only do so much damage. They can't do things like transfer money from the victim's account to their account or print more coins. This is because all transactions are recorded by the account?? Account owners sign, so even if they control the entire network, they cannot forge account signatures.

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In the bear market of blockchain, how to find the real valuable blockchain projects? Xiaobian explains from the following aspects:

1. Use the blockchain security technology testing center to see if it is MLM coin or air coin

no matter how advanced the concept is and how exaggerated the slogan is, the essence of any project still depends on technology. Blockchain projects without technology are just like the emperor's new clothes, We need a mirror that reflects the emperor's new clothes - blockchain security technology testing center

As one of the important initiators of blockchain security technology testing center, Tianhe Guoyun, the provider of ulord public chain technology, provides code audit function, which is a sharp tool for blockchain security technology testing center to identify blockchain projects. Code audit is to build a knowledge base of block chain code automatic audit with the help of machine learning and artificial intelligence. It can improve the efficiency of code audit and solve the security problem of intelligent contract. Through the quality evaluation of blockchain projects, exchanges, wallets and smart contract codes, blockchain code audit can prevent digital asset security accidents, provide code revision measures, security protection deployment and other services. It is reported that in addition to automatic audit, Tianhe cloud blockchain code audit can also customize expert team projects for all-round audit to help investors identify "fake projects" to a greater extent

2. Look at the team of blockchain project

the blockchain field can be regarded as a comprehensive field, involving cryptography, mathematics, economics, even social management and other disciplines. We have a reliable team. As I mentioned above, the ulord project brings together a large number of high-level R & D and operation personnel

3. It is not only the concept of stir frying, but also the application of it

there are many startups in the field of blockchain. If you want to become a few widely recognized high-quality projects, it is not feasible to just speculate on a set of concepts or theories. Only the projects with the ability of making blood and doing things on the ground are good projects

at present, DAPP ushare, an application based on ulord public chain, has been officially tested on October 15. Ushare Youxiang is the first decentralized experience value sharing platform in the world, and the first DAPP based on ulord public chain. Through the decentralized consensus mechanism, we can build an open, fair and just content evaluation system, encourage high-quality experience procers and experience sharing disseminators, and let the value of high-quality experience flow

there are nearly 100 teams and projects carrying out negotiation and cooperation with ulord public chain

4. Communities have autonomy attributes

whether communities have Dao (distributed autonomous organization) attributes, which is naturally suitable for blockchain,

about community governance. Whether it's the operation mode of the community or the organizational form of the developer community, it's actually a process from quantitative change to qualitative change. We have realized the importance of community

ulord adopts the community autonomy mode of "everyone can participate and contribute to the ecology"

we will have some new community governance modes, including the cooperation of some developers and the cooperation mode of large-scale open source community, which will be born and flourish

The incentive system mainly includes three aspects: first, participation in bookkeeping; Second, the contribution of network resources; Third, participate in community construction. As mentioned above, in the accounting part of our whole budget system, the pow + POS part accounts for 60%, the contribution level of participating in open source community code accounts for 10%, and the remaining 10% is used as an incentive for community operation. Therefore, we hope that more people can participate in the construction and promotion of ulord. We hope to build a platform, but the dividends obtained by this platform should be shared with everyone in the largest range, which is essentially different from Internet procts