An example operation includes one or more of solving, by a scheduler node, integer programming problem of maximizing a sum of organizations' endorsing peers that run chaincodes from a plurality of chaincodes within a consortium, making, by the scheduler node, endorsement policies (EPs) for the chaincodes from the plurality of the chaincodes to be satisfiable at any time, applying administrator's constraint of available endorsing peers to the maximized sum of organizations' endorsing peers, and adding resulting endorsing peers to a maintenance list.

A management method and apparatus for a system configuration independent of a smart contract for a blockchain is provided. The method includes that: a blockchain node receives a new proposal, where the new proposal includes at least one transaction; the blockchain node determines whether a special transaction exists in the at least one transaction, where the special transaction is used for storing system configuration content without service logic; the blockchain node verifies the special transaction according to a preset verification rule to obtain a verification result in response to determining that the special transaction exists in the at least one transaction; and the blockchain node performs, in response to the verification result indicating that the special transaction passes verification, update management on a current system configuration according to the system configuration content.

Embodiments of the invention are directed to systems, methods, and devices for securely performing federated tasks (e.g., the generation and utilizing of machine-learning models). A secure platform computer may operate a secure memory space. Entities participating in a federated project may transmit respective portions of project data defining the federated project. Each entity may provide their respective (encrypted) data sets for the project that in turn can be used to generate a machine-learning model in accordance with the project data. The machine-learning model may be stored in the secure memory space and accessed through an interface provided by the secure platform computer Utilizing the techniques discussed herein, a machine-learning models may be generated and access to these models may be restricted while protect each participant's data set from being exposed to the other project participants.

The present invention relates to a graphic-blockchain-orientated sharding storage apparatus, at least comprising a first sharding module and a second sharding module, wherein the first sharding module shards nodes having different resource capacity levels based on ledger data organized using a DAG structure, and the second sharding module assigns transactions to the shards matching with execution difficulty levels of the transactions, so that each said transaction is processed and stored in the shard corresponding thereto. The present invention incorporates the sharding technology into a graphic blockchain to provide a graphic-blockchain-orientated sharding storage method, so as to reduce pressure in terms of data storage and transaction processing on nodes of the graphic blockchain system. In addition, nodes, transactions, and data are dynamically divided according to resource heterogeneity among nodes, so as to further enhance performance of the graphic blockchain system while achieving efficient use of resources.

The present disclosure describes transaction-enabling systems and methods. A system can include a facility including a core task including a customer relevant output and a controller. The controller may include a facility description circuit to interpret a plurality of historical facility parameter values and corresponding facility outcome values and a facility prediction circuit to operate an adaptive learning system, wherein the adaptive learning system is configured to train a facility production predictor in response to the historical facility parameter values and the corresponding outcome values. The facility description circuit also interprets a plurality of present state facility parameter values, wherein the trained facility production predictor determines a customer contact indicator in response to the plurality of present state facility parameter values and a customer notification circuit provides a notification to a customer in response.

Devices can be configured to broadcast blocks incorporating artifact origination tokens. Devices can include network interfaces, memory; and processors. Processors can be configured to obtain artifact-to-time association elements. Artifact-to-time association elements can include artifact references and timestamps. Timestamps can include references to artifact references. Processors can be further configured to obtain artifact origination tokens. Artifact origination tokens can include artifact-to-time association element, certifier descriptors indicating certifier public keys, and/or certifier digital signatures. Certifier digital signatures can be generated based on certifier public keys and/or artifact-to-time association elements. Processors can be further configured to obtain ledger entries including artifact origination tokens with public keys, compute challenges based on ledger entries, and broadcast blocks incorporating the ledger entries. Blocks can be validated using cryptographic systems to obtain proof based challenges.

Provided is a method for delegating a device ownership based on a blockchain. The blockchain-based device ownership delegating method may include: transferring a device ownership request of a first user to a blockchain; providing a smart contract based ownership request event generated by the blockchain to a second user; transferring a device ownership change request of the second user to the blockchain; providing a smart contract based ownership change event generated by the blockchain to a device decentralized application (DApp); changing a device ownership; and recording a change history of the device ownership in the blockchain.

A process for centralized user file encapsulation, encryption, notarization and verification using a blockchain and a system that certifies data in a proprietary “capsule” file format, with tamper-proof blockchain are disclosed. By utilizing a hybridization of both cloud and blockchain storage mechanisms, the present invention allows for the performant and cost-effective certification of large amounts of data. Furthermore, the generation of the capsule allows for users to store both the data payload and its digital notarization. The system then allows for users to share the capsule with others (by way of permissions enforced by the notary system) and upload it for verification of authenticity at a later point in time.

A system and method for efficiently managing an executable environment involving multiple code-sign certificate chains. The system and method include receiving, by one or more processors and from a client device, a request for information to verify an authorization of a code bundle, the code bundle associated with a first signed code segment and a second signed code segment. The system and method include generating, by one or more processors, a list of certificates associated with the code bundle. The system and method include transmitting, by the one or more processors and to the client device, a message comprising the list of certificates, the message causing the client device to verify the code bundle based on the list of certificates.

Disclosed herein is a method of managing tachograph data based on a blockchain network. The method of managing tachograph data based on a blockchain network includes: allocating, by a tachograph, the block number of a block to be generated for tachograph data collected while a vehicle is driving; generating a block by using a server seed allocated by a server and a seed count value, which is a variable whose value changes each time the tachograph generates a block in an offline state; and transmitting the block hash value and block data of the generated block to the server.