Computer-implemented techniques for managing transactions of machine learning algorithm updates are described. In one embodiment, a computer-implemented is provided that comprises receiving, by a system operatively coupled to a processor, a request for an update to a machine learning model associated with a software program, wherein the request is received in accordance with a defined blockchain protocol, and wherein the request comprises model development data used in association with optimization of an instance of the machine learning model. The method further comprises, employing, by the system, a blockchain network to facilitate managing fulfillment of the request.

A method for optimizing blockchain storage size through use of relative values includes: receiving, by a blockchain node in a blockchain network that manages a blockchain, a plurality of blockchain data values, each including unspent transaction outputs, at least one destination address, and, for each destination address, an original currency amount; identifying a base value; modifying the original currency amount included in each blockchain data value to be a relative currency amount based on a difference between the identified base value and the original currency amount; generating a new block, the new block including a block header and the modified plurality of blockchain data values; and transmitting the generated new block to a plurality of additional nodes in the blockchain network.

An example operation may include one or more of capturing a current version of sensitive data by a data processor node, hashing, by the data processor node, the current version of the sensitive data, storing, by the data processor node, a hash of the current version of the sensitive data on a first blockchain, encrypting, by the data processor node, the current version of the sensitive data using a secret key, and storing the encrypted current version of the sensitive data on a second blockchain.

An example operation may include one or more of receiving, by a risk score module, a blockchain transaction proposal, obtaining transaction proposal data, obtaining external data, computing a risk score from the transaction proposal data and the external data, comparing the risk score to a risk score threshold, providing an endorsement decision, based on the comparison, and one of endorsing or rejecting the transaction proposal.

A blockchain-based privacy protection method for a CCN includes: executing, by a trusted AAC, an initialization algorithm to generate common parameters and a master key, generating a public key and a private key for each consumer and publisher, and randomly generating, by the trusted AAC, its own public key and private key; calculating a public key, and generating ciphertext and uploading the ciphertext to a CSP; performing transaction on-chaining; and during decryption, finding, by the consumer, transaction information of the content on the consortium blockchain, sending an interest packet based on the transaction information, and obtaining ciphertext CT through a storage address in the transaction information; generating, by the consortium blockchain, an access transaction based on access information of the consumer; sending the ciphertext CT to the consumer through a data packet; and locally decrypting, by the consumer, the ciphertext CT, and verifying correctness of the content.

Systems, methods, and computer-readable storage media for receiving, from an issuer, an electronic prescription for a patient, then fulfilling that prescription using a blockchain/distributed ledger verification system. The system receives multiple public keys, combines them, then performs a hash function (or other encryption) on that combination. The resulting output is then transmitted to a pharmacy for prescription fulfillment.

An example operation may include one or more of receiving a request associated with a key-value pair stored in a database, determining whether a state of the key-value pair has changed since a most recently received request, and in response to a determination that the state of the key-value pair has changed, generating a data block that includes a changed state of the key-value pair and adding the generated data block to a hash-linked chain of data blocks.

According to an example aspect of the present invention, there is provided a method, comprising: receiving an input ordered set of transactions after a genesis block or a preceding compressed block in a chain of blocks, generating a compressed block on the basis of the input ordered set of transactions, wherein processing of the compressed block results to an equivalent final state as processing of the input ordered set of transactions, and providing the compressed block to a distributed network for establishing a new chain epoch and replacing a set of uncompressed blocks associated with the input ordered set of transactions.

Systems and methods for establishing and fulfilling a smart contract between users and service providers are disclosed. A method includes creating, by one or more nodes in a computer network, a smart contract in response to a request from a user for services and providing the smart contract to a blockchain. The method then includes notifying service providers of the smart contract and receiving responses to the notifications from the service providers. Then the method includes identifying one or more service providers that can complete the service. The method then includes updating the smart contract to include data about the identified service providers. The updated smart contract includes account information for a user account of the user, and account information for service provider accounts of the identified service providers. Then a value interaction is initiated that pushes value from the user account to the service provider accounts.

Systems and methods for transferring value. A method includes posting, by a user device to a blockchain, a deposit transaction comprising a deposit value and conditions and updating, by the user device, a state according to a transaction amount. The method also includes transmitting, by the user device, a state update of the state to a server computer and responsive to transmitting the state update, and receiving, by the user device, a payment complete message comprising a tuple from the server computer. The method also includes verifying, by the user device, the conditions and processing, by the user device, a server deposit transaction on the blockchain in response to verifying.