Abstract: Techniques are provided for propagating updates to user profile information using a blockchain and for controlling access to user profile information using a blockchain. In one embodiment, a first block is added to a blockchain. The first block includes a first transaction ID that identifies a first transaction entry in the blockchain and a first version of user profile information encrypted using the first encryption key. The first transaction ID and a first decryption key that is able to decrypt information encrypted with the first encryption key is communicated to a plurality of entity computing devices that are to use the user profile information. The user profile information is updated by adding a second block to the blockchain that refers to the first transaction ID and includes a second version of the profile information encrypted using the first encryption key.

Abstract: Proof-of-Dynamic-Quorum is a consensus mechanism for blockchain networks that selects a dynamic quorum of nodes to validate a proposed block based on digital data included in the proposed block. In an embodiment, a request to add a proposed block to a blockchain is received by a node of a blockchain network. A composite key value is generated based on one or more values within the proposed block. Based on a composite-key-value-to-quorum-participants mapping that is indicated in one or more blocks that are already present in the blockchain, a validating quorum is determined to determine whether the proposed block is to be added to the blockchain. When each node of the validating quorum indicates that the proposed block is accepted, the receiving node writes the proposed block to the blockchain. Proof-of-Dynamic-Quorum enables real-world authority data to be considered when performing a consensus algorithm in a blockchain network.

Abstract: Techniques are provided for propagating updates to user profile information using a blockchain and for controlling access to user profile information using a blockchain. In one embodiment, a first block is added to a blockchain. The first block includes a first transaction ID that identifies a first transaction entry in the blockchain and a first version of user profile information encrypted using the first encryption key. The first transaction ID and a first decryption key that is able to decrypt information encrypted with the first encryption key is communicated to a plurality of entity computing devices that are to use the user profile information. The user profile information is updated by adding a second block to the blockchain that refers to the first transaction ID and includes a second version of the profile information encrypted using the first encryption key.

Abstract: Proof-of-Dynamic-Quorum is a consensus mechanism for blockchain networks that selects a dynamic quorum of nodes to validate a proposed block based on digital data included in the proposed block. In an embodiment, a request to add a proposed block to a blockchain is received by a node of a blockchain network. A composite key value is generated based on one or more values within the proposed block. Based on a composite-key-value-to-quorum-participants mapping that is indicated in one or more blocks that are already present in the blockchain, a validating quorum is determined to determine whether the proposed block is to be added to the blockchain. When each node of the validating quorum indicates that the proposed block is accepted, the receiving node writes the proposed block to the blockchain. Proof-of-Dynamic-Quorum enables real-world authority data to be considered when performing a consensus algorithm in a blockchain network.