A Transaction Authorization Method operating over a computer network comprising a plurality of interconnected computers and a plurality of resources, each computer including a processor, memory and input/output devices, each resource operatively coupled to at least one of the computers and executing at least one of the activities in the process flow, the method characterized in that it assembles an electronic authorization of a transaction in a manner which is verifiable by extracting and verifying whether role certificates of at least one type, associated with the authorization, are themselves authentic. The method eliminates the need of having to authorize each and every signature on a transaction individually by providing an authorization structure based on roles, this structure being accessible on a public network for verification that the transaction is authorized.