A fluid meter includes communication means arranged to receive an external opening or closing command to open or close an electromechanical valve suitable for being included in a cut-off unit mounted in the proximity of the fluid meter, authentication means arranged to authenticate a control frame including the opening or closing command, and a first communication interface arranged to transmit both the control frame and electrical energy to a second communication interface of the cut-off unit via a wireless link. The electrical energy is suitable for electrically powering the second communication interface of the cut-off unit.

Systems and methods for azimuthal multiplexing using three-dimensional diffractive optics An azimuthal optical multiplexing system includes a light source. The system includes two or more at least partially transparent plates. Each plate of the two or more plates has a structured or patterned surface positioned in an optical path of the light source. The system includes means for rotating at least one plate of the two or more plates axially with respect to at least one other plate of the two or more plates. The means for rotating is operatively coupled to the at least one plate. The structured or patterned surface is configured to modulate light directed along the optical path and through the two or more plates.

Systems and methods for azimuthal multiplexing using three-dimensional diffractive optics An azimuthal optical multiplexing system includes a light source. The system includes two or more at least partially transparent plates. Each plate of the two or more plates has a structured or patterned surface positioned in an optical path of the light source. The system includes means for rotating at least one plate of the two or more plates axially with respect to at least one other plate of the two or more plates. The means for rotating is operatively coupled to the at least one plate. The structured or patterned surface is configured to modulate light directed along the optical path and through the two or more plates.

A method for balancing a cross-domain broadcast network load of a blockchain includes is provided. By evenly distributing the load of cross-domain broadcasting to multiple cross-domain nodes, a utilization rate of a blockchain system can be increased, and ability of processing transactions in the blockchain can be improved. A computer device and a non-transitory computer-readable storage medium are further provided.

Provided are a method and apparatus for blockchain community governance, a device and a storage medium. The method is described below. A community governance transaction request initiated by a blockchain account and a governance scene to which the community governance transaction request belongs are acquired. Community governance authority of the blockchain account in the governance scene is verified according to the governance scene and governance token resource information in the blockchain account. In a case where a community governance authority verification is successful, the community governance transaction request is executed.

Provided are a method and apparatus for operating blockchain system, a device and a storage medium. The method is described below. To-be-processed blockchain data is processed through a kernel engine of a blockchain system, a kernel component call request is generated based on a kernel component interface during the processing process, and a kernel component is called according to the kernel component call request, where at least one kernel component is provided. The kernel component call request is executed through the kernel component to execute processing of a set component function and satisfy a processing requirement for the to-be-processed blockchain data.

A system provides document storage and sharing on behalf of nodes of a blockchain system. The system includes one or more databases and one or more servers. The one or more servers receive file content of a document from a first node of the blockchain system and stores the file content in the one or more databases. A file hash of the document is generated by applying a hash function to the file content. The file hash is sent to the first node, such as for sharing with one or more other authorized nodes. The one or more servers receives a request for the document from a second node of the blockchain system, the request including the file hash. In response, the one or more servers send the file content of the document to the second node.

A system and method for secure authentication and authorization between a user device and an Internet of Things (IoT) device that is associated with an asset. The method includes onboarding, using one or more processors that are operatively associated with a distributed ledger, the user device at least based on a public key identity of the user device; onboarding a user with the user device; onboarding an identity of the IoT device and the asset such that association between the asset and the IoT device is endorsed on the distributed ledger; and facilitating the user device to retrieve a first set of data packets representative of any of a relevant electronic authoritative document(s), associated consensus proof(s), and block header(s) from the distributed ledger.

A system and method for secure authentication and authorization between a user device and an Internet of Things (IoT) device that is associated with an asset. The method includes onboarding, using one or more processors that are operatively associated with a distributed ledger, the user device at least based on a public key identity of the user device; onboarding a user with the user device; onboarding an identity of the IoT device and the asset such that association between the asset and the IoT device is endorsed on the distributed ledger; and facilitating the user device to retrieve a first set of data packets representative of any of a relevant electronic authoritative document(s), associated consensus proof(s), and block header(s) from the distributed ledger.

The systems and methods herein provide for human- and machine-readable cryptographic keys from dice. In one embodiment, the system places a number of dice into an arrangement to fill a dice grid. The number of dice each contains a number of faces, and each of the faces of the dice includes an image. The system then captures, via a client device, an image of the arrangement. The system generates a cryptographic key from the captured image. This cryptographic key is a human-readable and machine-readable representation of the arrangement in a canonical sequence.