Abstract: The invention as described provides a method and system for tokenless authorization of commercial transactions between a buyer and a seller using a computer system. The method comprises the steps of registering a buyer, wherein the buyer registers with the computer system a PIN, at least one registration biometric sample, and at least one buyer financial account. The method also includes a seller registration step, wherein the seller registers with the computer system at least one seller financial account. In a proposal step, the seller offers a proposed commercial transaction to the buyer usually comprising price information. If the buyer accepts the seller's proposal, in an acceptance step, the buyer signals his/her acceptance by adding to the proposed commercial transaction the buyer's personal authentication information comprising a PIN and at least one bid biometric sample which is obtained from the buyer's person.