Abstract: A blockchain transaction confirmation system according to the present disclosure includes: a user information input interface to which user information is inputted; an external information input interface to which external information related to a cryptocurrency system is inputted; an appropriate confirmation number searcher configured to search for a block confirmation number appropriate for confirmation of a transaction in progress of creation by using the external information and the user information; and an appropriate confirmation number output interface configured to output the block confirmation number. According to the present disclosure, a user can automatically find out the block confirmation number required for safe and quick transaction.

Abstract: We disclose a blockchain e-voting system, where keeping the basic principles of voting does not require trusted-third parties. The system includes at least two vote nodes each having two sets of private and public keys, a voter management node, two smart contract modules, and a blockchain. A voter management node is configured to provide a cryptographic base for public key generation and to pre-register DIDs of vote nodes. A first smart contract module is configured to perform self-identification of vote nodes, encryption of votes, and generation of zero-knowledge proofs for the validity of their results, and to upload all the outputs to a blockchain. For the purpose, a vote node executes the first smart contract module, taking a voting decision, an asserted DID, the two sets of public and private keys as inputs, where one set of keys is for the self-identification, and another set is for the encryption.