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A blockchain voting system based on the feedback mechanism and Wilson score is proposed to solve the problem of the malicious votes behavior. Firstly, the relatively accurate supporting rate and ranking for candidates are obtained using the Wilson score. Secondly, different feedback coefficients are calculated according to the above parameters. Finally, the account points are adjusted according to the feedback coefficients. The feedback mechanism is designed in the voting smart contract, and the smart contract is deployed on the blockchain to ensure the enforcement of the feedback mechanism. A fully functional smart contract is designed and briefly verified in this paper. The experiment is conducted under the K-out-of-L type of weighted voting. Experimental results show that the Wilson score can accurately modify the candidates&rsquo, supporting rates, and the feedback mechanism can effectively suppress malicious votes.

In the digital age, malicious attacks have caused incalculable losses to individuals and enterprises. The traditional centralized preservation of threat intelligence is easy to be attacked, resulting in malicious tampering of intelligence, unequal threat intelligence, and low efficiency of intelligence transmission channel. Based on the blockchain technology, this paper registers the threat intelligence, designs the smart contract for the point-to-point transmission and sharing of threat intelligence, so as to ensure the effectiveness, credibility and security of intelligence transmission, and realize a decentralized threat intelligence deposit certificate and sharing system.

In recent years, the number of malware continues to grow, which has a huge impact on individuals, enterprises and so on. In this paper, a method of malware classification and sharing based on Threat Intelligence is proposed, which transforms malware into gray-scale image and uses broad learning system to classify malware. we design a malware intelligence storage system based on IPFS and Ethereum smart contract. For classified intelligence, it is uploaded by user node to realize the prevention from single node to full node. Experiments show that the performance of this algorithm is better than other classification algorithms, and the decentralized storage system based on blockchain is more secure and efficient.

Stored-value cards are used more and more widely. But there are some problems in the present stored-value card platform: 1. The service agreement of stored-value card is not clear enough; 2. The refund process of users is inconvenient; 3. The transfer of stored-value can not be realized among users; 4. The security of accounts is not guaranteed. Smart contracts are computer contracts written in code, which are enforced directly by computers. This paper proposes a stored-value card platform in which the service contracts are expressed with smart contracts. The smart contract is executed on the blockchain. Blockchain technology, in which accounts are decentralized and data is resistant to modification, is applied to improving reliability in the consumption process. The platform is built on the private blockchains of Ethereum, which is designed for small merchants. ECDSA (Elliptic Curve Digital Signature Algorithms) is used to asymmetrically encrypt accounts. Some functions, such as stored-value issuance, stored-value consumption, commodity purchase, are designed in this system.

Leakage of user privacy and vandalism of the sharing bike have been the most serious problem since sharing bike came on the scene. Accordingly, it is very urgent to rebuild the underlying trust mechanism. Most bike sharing systems are centralized, leading to overpressure on the central server. This paper proposes a bike sharing system based on blockchain service platform and a shared operation mode of C2C. The system uses the blockchain system as the trust guarantee. The extra chain payment - lightning network is used to improve the efficiency of the blockchain system and the smart contract is used to provide the rights and interests of the two parties.