5773 results about "Smart contract" patented technology

The present invention relates to a securities trading system that utilizes a distributed blockchain ledger to conduct security transactions. Users are provided with cryptographic wallets that enable the users to access a peer-to-peer network of computing nodes on which the distributed blockchain ledger is managed. The securities made available through the network may be stored directly on the blockchain ledger itself. Smart contracts may be utilized to transfer the securities among the users and to verify that all transactions are in compliance with applicable regulatory rules and other restrictions.

Embodiments enable a transparent self-managing rewards program using a smart contract block chain distributed network by receiving a transaction record associated with a smart contract, wherein the transaction record comprises input data indicating one or more actions taken by a user; accessing a distributed ledger stored in the memory device, wherein the distributed ledger is updated based on communications from a block chain distributed network; using smart contract logic associated with the smart contract, determining whether the indicated one or more actions meets a condition of the smart contract, thereby validating the transaction record, and in some embodiments, in response to determining the one or more actions meets the condition of the smart contract, thereby validating the transaction record, initiating rewarding the user with rewards corresponding to the condition.

A system and methods for managing intellectual property using a blockchain are provided which may include one or more elements which forms a comprehensive foundation for an eco-system for innovation and intellectual property management. The elements may include: an intellectual property distributed ledger, an intellectual property digital policy server, non-binary trust models, automatic ontology induction, modifications to the blockchain “mining” and “proof of work” system, appstore for related applications, partial transparency transactionalized search engine, persistent and encapsulated software trust objects, licensing royalty smart contract with auditable payment tracking, micro-equity incentives, automated fraud detection intellectual property management dashboards, innovation workflow broker, innovation optimization tools, disruption mapping, and intelligent just-in-time learning. The system combines and integrates these functions to enable personal, intra-enterprise, inter-enterprise and extra-enterprise recordation, collaboration, searchability and its benefits, licensing and tracking of information regarding intellectual property over a networked distributed computing system.

The invention provides a method and system for privacy protection of block chain transaction. The method comprises: a transaction group is established between nodes of a block chain system, a user establishes an account at a node, and the node generates public and private key information of the account and then joining of a group is carried out; a transaction request node encrypts transaction information by using a broadcast encryption algorithm, carries out group signature processing on the encrypted transaction information, and then broadcasts the transaction information after broadcast encryption and group signature processing; a common non-account-recording node verifies the transaction information and then broadcasts the transaction information, an account-recording node decrypts thetransaction information and performs an intelligent contract to carry out account recording, broadcast encryption is carried out and then the information is recorded into a public account book, wherein the stored data are only allowed to be opened by the account-recording node, the transaction request node and an administration node. With the broadcast encryption algorithm and group signature technology, a privacy protection problem in the block chain system is solved and the traceability of the transaction is ensured.

In certain embodiments, blockchain-based validation of a bearer of a private key used to register a record on a blockchain may be facilitated. In some embodiments, reference information associated with a user and with a blockchain record may be obtained. The reference information may be based on a blockchain address associated with the user and with the record. The blockchain address may be based on a public key corresponding to a private key used to register the record, where the keys are a key pair associated with the user. A smart contract may be caused to be generated based on the reference information and provided on a blockchain. The smart contract may be configured to automatically validate a transaction using the public key. A notification indicating that the user registered the record may be obtained responsive to the smart contract validating a transaction signed using the private key.

Blockchain-based, smart contract platforms have great promise to remove trust and add transparency to distributed applications. However, this benefit often comes at the cost of greatly reduced privacy. Techniques for implementing a privacy-preserving smart contract is described. The system can keep accounts private while not losing functionality and with only a limited performance overhead. This is achieved by building a confidential and anonymous token on top of a cryptocurrency. Multiple complex applications can also be built using the smart contract system.

The invention discloses a smart contract protection system based on a trusted environment, including a client, block chain nodes, a data provider, a trusted environment, a non-trusted environment, a smart contract information processing module (A), a block chain node information transmission module (B) (such as a node interaction interface in the Ethereum), an input data transmission module (C), a smart contract execution module (D), a local contract information storage pool (E) and a block chain smart contract storage pool (F). The client is in communication connection with the block chain nodes. The data provider is in communication connection with the block chain nodes. The block chain nodes are in communication connection with one another. The technical problem that the copyright of smart contracts cannot be protected and the rights and interests of smart contract users are damaged due to the fact that the information of smart contracts may easily leak in the existing smart contract system and the technical problem that data may be stolen due to data leakage are solved.

A method of synchronizing transactions between blockchains comprising receiving first and second pluralities of transactions on a first private blockchain network and recording them to first and second private blocks on the first private blockchain network, respectively, generating a first merged block comprising the first private block and the second private block and recording the first merged block to a single block on a second blockchain network, recording each of the first and second private blocks and the first merged block to a first private smart contract linked to the first private blockchain network, performing a synchronization process between the first private smart contract and a second smart contract linked to the second blockchain network, defining a second smart contract, and performing a checkpointing process between the first private smart contract and the second smart contract. The first private blockchain network has a parameter difference from the second blockchain network.

A method for creating an asset-backed distributed ledger token representing a smart contract, the token being backed by a pledge of an illiquid form of a precursor or means of production of a commodity asset, comprising receiving a pledge of unrefined or pre-commodity asset, digitizing the unrefined commodity asset into fractional representations of the commodity asset using smart contracts on a distributed ledger network, and allowing account holders access to the perform transactions on the distributed ledger network to trade the fractional representations under the terms of the smart contract.

The invention provides a block chain consensus method based on a DPOS and nodes. The method comprises the following steps that a transaction node generates a transaction request of executing an intelligent contract and broadcasts the transaction request to a block chain network; an accounting node receives the transaction request, then executes the intelligent contract according to the transaction request, stores a generated contract execution result and a transaction request in a newly-generated block and broadcasts the block to the block chain network; and an agent node receives the block, then executes the intelligent contract according to the transaction request and verifies the contract execution result. By using the technical scheme provided in the invention, a common node does not need to verify the contract execution result so that a calculating capability of a whole network can be effectively increased.

The invention discloses a data sharing exchange system and method based on a block chain. The system comprises a data sharing exchange center, a front-end system and a block chain basic platform. Thedata sharing exchange center comprises a data sharing exchange control system, a data resource center and a client; The front-end system comprises a data acquisition system, a shared exchange module and a feedback module; The block chain basic platform comprises an alliance chain module and a data sharing exchange management module, the alliance chain module is responsible for intelligent contractand verifying credibility configuration of nodes, the intelligent contract generated in the data sharing exchange process is verified, and the data sharing exchange center communicates with the front-end systems in an alliance chain mode. According to the invention, the credit problem and the incentive problem of data sharing exchange in a multi-party participation environment are solved, the security and the reliability are ensured, the enthusiasm of a user for publishing and updating the sharing exchange data is promoted, and meanwhile, the guiding effect on user decision can be realized.

A method of issuing blockchain-based digital certificates comprising receiving from a user hashed user identification information and object information, recording to a digital certificate smart contract deployed at a digital certificate smart contract address on a blockchain network the hashed user identification information and object information and a timestamp of when the hashed user identification information and the object information were received, defined as a received timestamp, signing the digital certificate smart contract with an issuer signature, performing a user identity verification process to confirm a user identity, upon confirming the user identity, generating a combination certificate configured to be shared by the user to verify the user's ownership of an object associated with the object information, and sending the combination certificate to the user.

The invention relates to the technical field of big data, block chains and smart contracts, and in particular to a block chain smart contract-based data transaction method. According to the block chain smart contract-based data transaction method, purchase and sale behaviors of purchasers and sellers of transactions are recorded through block chains, automatic execution of the transactions is realized by utilizing smart contracts, and big data for the transactions is not recorded in the block chains and is encrypted and stored in an external data memory, so that the purchasers only can obtain the data after the smart contracts are successfully transacted; and moreover, the purchasers can publish transactions through a supervisory block chain consensus network, so that third-party witness is realized and the security guarantee of data transactions is increased.

The invention provides a method for dynamically changing a consensus node in a practical Byzantine fault tolerant consensus mechanism. The method comprises the following steps: a system administratorinitiates a change request of increasing or decreasing the consensus node to the consensus node as a system-level transaction, and the change request is signed by using a private key of the system administrator; the consensus node verifies the change request, if the verification is successful, a special system transaction head is added to the change request, the change request is broadcast, and each consensus node puts the change request into a priority transaction queue; a new round of consensus operation is performed, a selected proposal node proposes a proposal block including the change request and broadcasts the proposal block to all consensus nodes, all the consensus nodes verify transactions in the proposal block, firstly verify the transaction heads of the transactions, and enter system transaction operation logic rather than smart contracts when a special system transaction head is verified; and after reaching a consensus, the node executes the change request and updates a consensus node set list, and the updated consensus node set list is stored to a local file of the nodes.

The invention relates to a Raft-algorithm-based block chain consensus mechanism. The mechanism comprises: consensus node information of a block chain is stored into the block chain and an initial state of a consensus node is set to be a follower state; on the basis of a Raft algorithm, a consensus node of an initial leader state is selected by combining the height of the block, wherein the consensus node of the leader state is used for recording a transaction event and generating a new block; and at the end of the term of the consensus node of the leader state, a consensus node of a leader state is selected again. Because the height of the synchronous block is considered for reference during the consensus node selection process of the leader state, the consensus efficiency can be improved and the transaction confirmation time can be shortened; and because the consensus node is selected again at the end of the term, the system fault tolerance can be improved. Moreover, on the basis of uniqueness of the consensus node selection of the leader state, each block has final consistency, thereby avoiding block chain furcation. Meanwhile, dynamic entrance and exit of a consensus node can be realized based on a management mechanism of the consensus node by an intelligent contract.

A method of exchanging value across a blockchain network comprising receiving first and second transaction smart contracts, recording the first transaction smart contract to the second transaction smart contract, and registering global variable names and defining values thereof. The method further comprises receiving a transaction notification and recording the transaction to the second transaction smart contract.

An Internet of Thing (IoT) device includes a camera coupled to a processor; and a wireless transceiver coupled to the processor. Blockchain smart contracts can be used with the device to facilitate secure operation.

The invention provides an intelligent contract implementation method. The intelligent contract implementation method includes the steps that an intelligent contract is established, the contract C is a triad group, C= (I, M<*>, {M1, M2, ..., Mm}), the contract comprises contract party information I and a set of contract state machines M* and contract state execution machines {M1, M2, ..., Mm}, wherein Ii represents information of the i contract party Pi, i=1 ...m, and m contract parties participate in the contract; states and events of all contract parties are input and stored in a database which is high in safety; the intelligent contract is executed, and the execution result of the contract is obtained. The invention further provides an intelligent contract system based on a block chain, and the system comprises a user interface, an intelligent contract device and a block chain management module.

System and method for executing cryptographically secure transactions in a network comprising a public ledger, comprising associating a first proposed transaction with a public keys smart contract and associating at least a second transaction including private data and public data in said network with a cryptographically secure transaction.

The invention discloses an electronic medical record storage and sharing model and method based on the blockchains and solves problems of patient's rights of access to personal medical data and insecure storage and sharing of sensitive medical data in the prior art. The model is characterized by comprising data creators, data owners, cloud storage, federated blockchains and data consumers, whereinthe blockchain is a control center. The method comprises steps that system initialization is performed; medical data are acquired, and data storage with intercepted signatures is employed; data publishing with the improved DPOS consensus mechanism is employed; data sharing based on smart contracts is performed. The method is advantaged in that security, reliability, privacy protection and securestorage are achieved, in combination with the cloud storage technology and the interceptable signature technology, in the federated blockchains, users can set sharing conditions through the smart contracts, safe and effective data sharing and access can be realized, and strong practicality is achieved.

The Point-to-Point Transaction Guidance Apparatuses, Methods and Systems (“SOCOACT”) transforms smart contract request, crypto currency deposit request, crypto collateral deposit request, crypto currency transfer request, crypto collateral transfer request inputs via SOCOACT components into transaction confirmation outputs. Also, SOCOACT transforms virtual wallet address inputs via SOCOACT (e.g., P2PTG) components into transaction confirmation outputs. In one embodiment, the SOCOACT includes a point-to-point payment guidance apparatus, comprising, a memory and processor disposed in communication with the memory, and configured to issue a plurality of processing instructions from the component collection stored in the memory, to: obtain a target wallet identifier registration at a beacon. The SOCOACT then may register the target wallet identifier with the beacon and obtain a unique wallet identifier from a migrant wallet source associated with a user at the beacon. The SOCOACT may then obtain a target transaction request at the beacon from the migrant wallet source and commit the target transaction request for the amount specified in the target transaction request to a distributed block chain database configured to propagate the target transaction request across a distributed block chain database network for payment targeted to the target wallet identifier registered at the beacon.

A single sign-on system using blockchain is disclosed. The single sign-on system may interconnect various organization systems over a peer-to-peer network, with each organization system having a blockchain node and an application programming interface (API). The blockchain node invokes and uses a smart contract to write registration credentials to the blockchain during a registration process. During a login process, the blockchain node invokes the smart contract to determine whether login credentials match stored login credentials in the blockchain. In response to matching login credentials, the API may generate a single sign-on token that can be used by a user device to access one or more organization systems connected over the network.

The invention belongs to the technical field of identity authentication, and specifically provides an Internet of Things identity authentication method based on a blockchain. The basic steps of the Internet of Things identity authentication method provided by the invention are as follows: an entity calls an intelligent contract by means of an own key to accomplish the registration in an identity authentication system; each entity can call the intelligent contract to set an access strategy so as to limit the access of other entities to the entity and to form a trust network of the Internet of Things; when one entity accesses the data of the other entity, the entity needs to apply for a token from the intelligent contract to obtain the access qualification, and the intelligent contract checks whether the entity initiating the access has the access qualification according to the access strategy set by the accessed entity in the trust network between the entities, and if yes, the intelligent contract generates the token and returns the token to the entity initiating the access; or otherwise, the intelligent contract returns token application failure information. By adoption of the method provided by the invention, a centralized authority mechanism in an identity authentication process is removed, malicious tampering of records of identity authentication and data access is prevented, a strategy execution result is not manually manipulated, and a fair, transparent and credible execution environment is provided for the identity authentication of the entities in the Internet of Things.

Provided is a process that includes: determining whether to execute a software asset based on trust records documenting provenance of the software asset published to a blockchain, wherein determining whether to trust the software asset comprises: accessing the trust record, verifying the trust record has not been tampered with subsequent to publishing, verify that a hash digest based on the software asset matches a hash digest associated with the trust record and published to the blockchain; verifying that trust assertions of the trust record are cryptographically signed by trusted entities specified by entity criteria, and verifying that the trust assertions satisfy execution criteria.

The invention discloses a construction equipment Internet of Things system and method based on the blockchain technology. The system comprises a plurality of Internet of Things nodes, a plurality of blockchain nodes, a plurality of intelligent terminals and a plurality of user terminals, the detection of various environmental information in the building and the monitoring of electrical equipment can be achieved, data are stored in the blockchain nodes in a distributed manner, a data transmission process is encrypted by using the asymmetric encryption technology, and data sharing is performed through a smart contract. According to the construction equipment Internet of Things system and method disclosed by the invention, the blockchain technology is combined with the Internet of Things technology, the consensus mechanism, distributed storage, asymmetric encryption and smart contract of the blockchain technology are applied to the Internet of Things, and many problems faced by the current Internet of Things are solved.

The invention discloses an electronic invoice management system and a method based on distributed accounting. The system comprises multiple verification nodes. Each verification node comprises an electronic invoice contract module and an agreement module, wherein the electronic invoice contract module comprises an electronic invoice service intelligent contract and is configured to be used for receiving a transaction command of the electronic invoice service intelligent contract and executing the transaction command according to a result of the agreement module so as to establish a block and form a block link, and the electronic invoice service intelligent contract is operation performed on an electronic invoice. The agreement module is configured to be used for communicating with other verification nodes when being triggered and making an agreement on a transaction command sequence between all verification nodes for the received transaction command according to an agreement algorithm. According to the invention, tamper-proofing is realized and the system and the method are cost-effective.

Systems and techniques, including a privacy service, facilitate selecting, defining, controlling, verifying, and auditing privacy-impacting behaviors of devices in alignment with the privacy behavior expectations of individuals and other entities. Techniques and systems are presented to facilitate controlling and verifying the privacy behaviors of privacy-impacting devices. Techniques and systems for defining and sharing individualized privacy behavior preferences are described. Techniques and systems are disclosed for privacy preference resolution protocols that allow for the automated or interactive resolution of conflicts that arise between individuals in multi-actor environments or ambiguous contexts. Accountability and audit mechanisms assist in verifying the control state of devices with respect to their privacy behavior preference inputs. A trust-enhancing and technically transparent system architecture includes a distributed application network, distributed ledger technology, smart contracts, and / or blockchain technology.

The Collateral Management with Blockchain and Smart Contracts Apparatuses, Methods and Systems (“CMBSC”) transforms borrow transaction request inputs via CMBSC components into borrow transaction init notification, borrow transaction sync notification outputs. A borrow transaction request associated with a borrow transaction is obtained. Transaction attributes associated with the borrow transaction are stored in a database. The transaction process optimizer component is notified regarding the borrow transaction. A blockchain sync notification associated with the borrow transaction is obtained from the transaction process optimizer component. The stored transaction attributes associated with the borrow transaction are filtered. A smart contract associated with the borrow transaction is generated. The generated smart contract is sent to a blockchain node of a blockchain network. A smart contract notification associated with the smart contract is received. A push notification regarding the smart contract notification is provided to a user interface component of a user's client.

The invention discloses a cross-block chain digital asset transfer method and device; the method comprises the following steps: receiving a transfer application requesting to transfer first quantity digital asset from a user party node in the first block chain to a receiver party node in a second block chain; responding to the received transfer application, and invoking an agreed intelligent contract program between the first and second block chains; equivalently converting the first quantity digital asset into the second quantity legal general data according to the invoked intelligent contract program; writing a digital asset record deducting the first quantity into the first asset database of the user party node, and writing a legal general data record adding the second quantity into the second asset database of the receiver party node. The method and device can ensure the digital asset total quantity remaining unchanged in a different block chain transfer process, thus preventing transfer losses, ensuring fast transfer, and preventing participation party fake voting problems.

A flexible blockchain smart-contract deployment design supporting both selective on-chain deployment and remote deployment with verified determinism and other valuable blockchain properties.