Proof, not trust

Commerce has always run on proof. When a debt was paid, the creditor handed over a receipt. In 1289 that receipt was called a quitanza. The matter was provably closed, for both sides.

Card networks spent fifty years building a proof layer for humans: chargebacks, dispute rights, liability frameworks. That machinery is why strangers transact online at all.

Agent payment rails settle instantly and finally, with none of it. No recourse. No evidence standard. No answer when the agent bought the wrong thing.

Quitanza brings the receipt back, as cryptography. Signed mandates. Escrowed funds. Delivery verified against terms fixed before the work began. Disputes resolved at machine speed, on evidence neither side can revise. Every transaction ends in a quitanza: signed, hash-chained, independently verifiable.

The matter is closed. Both sides can prove it. That is the entire product.

Pacta sunt servanda. Agreements must be kept, now by machines too.