A method includes: processing a request to execute a purchase transaction for a virtual asset of a video game, to transfer ownership of the virtual asset from a first user account to a second user account, to transfer an amount of virtual currency from the second user account to the first user account; responsive to the request, accessing a blockchain to perform an anti-fraud verification, including analyzing data of a prior transaction involving the virtual asset that is stored to the blockchain; responsive to the anti-fraud verification providing a result that does not indicate fraudulent activity, then generating transaction data based on an identifier for the first user account, an identifier for the second user account, an identifier for the virtual asset, and the amount of virtual currency, and submitting the transaction data to a node network, to write the transaction data to a block of the blockchain.