A processor-implemented method records and maintains a record of browser events in a blockchain using a peer-to-peer network. One or more processors detect one or more browser events for a browser on a computer. The processor(s) transmit transactions associated with the browser event(s) to a peer-to-peer network of devices that create a blockchain, which includes one or more blocks that describe the browser event(s), where the blockchain records and maintains a record, of browser events, that includes records of uniform resource locators (URLs) browsed by a user, bookmarks added to the browser, and search terms searched by the user. The processor(s) perform a vulnerability analysis to determine how vulnerable the computer and the browser are to a malicious attack, and adjust a frequency of transmitting the transactions from the computer to the peer-to-peer network of devices according to how vulnerable the computer and the browser are to the malicious attack.