What is Nonrepudiation?
Nonrepudiation is when a party can’t plausibly deny taking an action: signing a contract, approving a payment, changing a beneficiary. It weaves together cryptography (signatures, timestamps), identity binding, and tamper‑evident logs so events are defensible in the face of dispute.
Practically speaking: strong enrollment of signers, device‑bound credentials, short‑lived tokens, and audit trails of who, what, when, where. Screenshots don’t count; signed artifacts do. As value heightens, weave in selfie‑to‑ID checks within identity verification so signatures map to real people, not hijacked or borrowed inboxes. At the payment edge, tie controls to payment fraud prevention so approvals and representment share the same set of evidence.
