Aspects of the disclosure relate to multicomputer systems and methods for data authentication and event execution using a blockchain approach. Any full node computing device in a network, including a data authentication and event execution computing platform, may receive data from one or more sources. The computing platform may verify the authenticity of at least one aspect of the received data. Once the authenticity of the data has been verified, the computing platform may generate a new block of a user's blockchain by cryptographically encrypting the received data, may add the new block to the user's blockchain, and may store the updated blockchain. The platform may then transmit an indication that the received data has been authenticated to the data source. In addition, the computing platform may generate a command configured to execute an action associated with the new block and may transmit the command to the data source.