Abstract: Aspects of the disclosure are directed to a method for use on a blockchain network that includes an accounting node subnetwork having accounting nodes configured to record a data block onto a blockchain and a service node having service nodes configured to verify data blocks recorded by the accounting nodes onto the blockchain. The method can include generating a signature based on transaction information to be included in a data block to be added onto the blockchain by using a key specific to the accounting node. The method can further include adding the transaction information and the generated signature to the data block and adding the data block onto the blockchain, and transmitting the signature to the service nodes in the service node subnetwork, so that the service nodes perform signature verification on the signature based on the key specific to the accounting node.

Abstract: This application provide a data management method for a blockchain system, a medium, and an electronic device. The system includes an accounting node sub-network and a service node sub-network. The method includes: adding, after an accounting node generates a first data block, first key information used for verifying a block header of a second data block generated after the first data block to a block header of the first data block; generating a signature corresponding to the first data block, and adding the signature corresponding to the first data block to the block header of the first data block; and releasing the block header of the first data block to the service node sub-network, to cause a service node to verify the signature included in the block header of the first data block, and obtaining the first key information after a successful verification to verify the block header of the second data block.

Abstract: A glass cleaner includes a hand-held rod and a cleaning frame mounted at the end of the hand-held rod. The cleaning frame is provided with at least two parallel and spaced scraping strips. Both the front and rear ends of a connection portion between the hand-held rod and the cleaning frame are provided with the scraping strips.

Abstract: A handheld rotary cutting blade includes a toroidal cutting blade and a handheld handle configured to package a section of the toroidal cutting blade; the toroidal cutting blade is arranged to be annular; another section of the toroidal cutting blade extends beyond the handheld handle; an outer side edge of the toroidal cutting blade is provided with a cutting edge; two rollers configured to respectively press against and support opposite inner sides of the toroidal cutting blade are respectively hinged at two opposite ends of the handheld handle; the two rollers are located at the same side relative to the center of the toroidal cutting blade, and the side is a side which keeps away from the middle of the handheld handle relative to the center; two rollers are respectively arranged at two ends of the handheld handle.

Abstract: A handheld rotary cutting blade includes a toroidal cutting blade and a handheld handle configured to package a section of the toroidal cutting blade; the toroidal cutting blade is arranged to be annular; another section of the toroidal cutting blade extends beyond the handheld handle; an outer side edge of the toroidal cutting blade is provided with a cutting edge; two rollers configured to respectively press against and support opposite inner sides of the toroidal cutting blade are respectively hinged at two opposite ends of the handheld handle; the two rollers are located at the same side relative to the center of the toroidal cutting blade, and the side is a side which keeps away from the middle of the handheld handle relative to the center; two rollers are respectively arranged at two ends of the handheld handle.