Abstract: A backbone node access method and a blockchain system are disclosed. In the backbone node access method, after receiving an access request of a backbone node in a second blockchain system, a first node of a first blockchain system determines a voting node and requests the voting node to vote on the access request; the voting node feeds back a voting result; after determining to approve the access request according to the voting result, the first node determines a second node and sends anchoring message to the second node; and the second node is anchored with the backbone node based on the anchoring message, so that the backbone node accesses to the first blockchain system, the second blockchain system becomes a slave chain system of the first blockchain system, and the first blockchain system becomes a master chain system of the second blockchain system.

Abstract: The embodiments of the disclosure disclose a method and a system for blockchain access authority control, an apparatus, a program and a medium. The system comprises a plurality of blockchain nodes. For each blockchain node, a corresponding distributed node is further deployed in a node apparatus where the blockchain node is located, and the distributed nodes form a distributed storage system. A first blockchain node receives an access request sent by a first client, determines a possession of a first authority to access the blockchain system by the first client according to role confirmation information, and then determines a distributed node where access content is located from the distributed storage system. After determining a possession of a second authority to access the distributed node where the access content is located by the first client according to authority authentication information, the access content is obtained and returned to the first client.

Abstract: An electrocatalyst including an active catalyst component and an additive including a transitional metal, transitional metal oxide or complex precursor thereof, products including such an electrocatalyst and methods of making and using the same.

Abstract: A data set is transformed to a domain in which values are robust to distortion. The values are then expanded to carry auxiliary data. To recover the data, the data set is transformed into the domain, further transformed to get a set of possibly expanded data, and then processed to extract auxiliary data from the expanded values.

Abstract: An electrocatalyst including an active catalyst component and an additive including a transitional metal, transitional metal oxide or complex precursor thereof, products including such an electrocatalyst and methods of making and using the same.