Abstract: A system for engaging in secure transactions over an internetwork, involving, a consumer, a merchant and a Transaction Authority as parties to a transaction. To initiate the transaction the consumer makes an inquiry with the merchant who then returns a signed offer. The consumer then accepts the offer by also signing the offer. The doubly signed offer is then forwarded to the Transaction Authority. The Transaction Authority validates the transaction by checking both the authority and identity of the merchant and the consumer. The Transaction Authority then signs the offer to create a triply signed offer. The Transaction Authority returns the triply signed offer to the merchant. Once the merchant has a validated offer they are then able to request settlement of the transaction from the Transaction Authority, either immediately, or at some future date by sending a settlement request to the Transaction Authority.