Abstract: A distributed transaction ledger (e.g. blockchain) is used to control access through access points in an access control system. During normal operation, access control devices (e.g. system controllers and door controllers) generate and broadcast transaction information to a validation network. The validation network maintains a distributed transaction ledger for the access control system, for example, by validating and distributing the transaction information across the validation network according to predetermined consensus criteria. The devices perform access control functions based on transaction information retrieved from the transaction ledger. Door controllers receive identification information from user devices (e.g. identification badges, mobile computing devices) and send the identification information to the validation network. A predetermined number of responding nodes generate verification information based on authorization information in the transaction ledger.

Abstract: A distributed event engine for controlling distributed devices of a building management system executes as discrete event processes on distributed devices with sufficient computing power and availability. The distributed devices communicate via a peer-to-peer network and a distributed ledger (e.g. blockchain). An event engine configuration module assigns the event processes to the distributed devices based on device and capability information published to the distributed ledger. An edge device scoring process executing on the distributed devices executing the event processes determines which other distributed devices to control based on which devices are compatible with local event processes and/or electrically and geographically close, resulting in decreased latency, vulnerability to hacking and corruption of data.

Abstract: A distributed transaction ledger (e.g. blockchain) is used to control access through access points in an access control system. During normal operation, access control devices (e.g. system controllers and door controllers) generate and broadcast transaction information to a validation network. The validation network maintains a distributed transaction ledger for the access control system, for example, by validating and distributing the transaction information across the validation network according to predetermined consensus criteria. The devices perform access control functions based on transaction information retrieved from the transaction ledger. Door controllers receive identification information from user devices (e.g. identification badges, mobile computing devices) and send the identification information to the validation network. A predetermined number of responding nodes generate verification information based on authorization information in the transaction ledger.