Systems and methods for controlling access to a blockchain are disclosed. The systems and methods are comprised of a security agent, a controller, an authenticator, a rules engine, and a policy engine. In certain embodiments, the security agent receives a message from an application, parses the message, and transmits the message to the controller if the message comprises one or more predetermined applicable rules or policies. The controller receives the message with its rules and policies, queries the rules engine and the policy engine to apply the rules and policies, and transmits an authentication request to the authenticator. The authenticator then requests an authentication signal from a user and transmits the results to the controller. The controller applies the results and forwards them to the security agent, which may or may not release the message to the blockchain depending the results.