A method and apparatus for generating a tradable security includes confirming a vendor’s compliance with predefined terms of a commercial transaction, such that a buyer is obligated to make a due payment. A preferred embodiment comprises a self-adjusting correlatorintegrator that uses no historical timing information. The seal holder urges the plunger-sealing ring against the cylinder-sealing ring and the low-pressure ring, and urges the latter two rings against the recess bottom and against each other.