What is non-repudiation?

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Non-repudiation.

Trusting a service completely without any doubt is Non-repudiation.
The complete confidence that an entity will do exactly what they have committed to. The entity cannot deny a previous commitment or action by providing incontestable proof.

Non-repudiation can be between two or more parties. Where multiple entities are involved it is called multi-party non-repudiation (MPNR).

This is one of the many benefits of using Blockchain technology and smart contracts.