Abstract: A method of providing an electronic seal to a real estate deed, mortgage or land trust document using a biometric measurement of the original signer to the document, which biometric measurement is stored in a central computer for access at a future date when such document is presented for transaction. The software of the system of the invention generates an authorization code or number representative of the stored unique biometric measurement, which code is then physically placed on, or inserted into, the document evidencing the biometric seal of the user. The correlating code is unique to the document and the stored biometric seal therefor. The unique biometric measurement is “married” to the legal document to provide a “legal seal” and obviate the use of mechanical, waxed, embossed or printed seals.