Implementations of the disclosure are directed to using a distributed ledger network and a location beacon device that transmits a secured representations of a location distributed ledger addresses to prove the presence of a user at a particular location and time. In implementations, a method includes: receiving, at a first time, a first beacon, the first beacon including a first secured representation of a distributed ledger address associated with a location; transmitting the first secured representation of the blockchain address to a server system operating as a node on a distributed ledger network; receiving a request from the server system to obtain, at a second time after the first time, a second secured representation of a distributed ledger address; in response to the request, obtaining a second secured representation of a blockchain address associated with a location; and transmitting to the server system, the second secured representation of the blockchain address associated with the location.