Nuclear verification is the monitoring of nuclear activities and the detection of violations of international treaties and other nuclear nonproliferation commitments. 

Nuclear Verification is one of the three main principles of the IAEA, and the IAEA serves as the international nuclear inspectorate: "Through a set of technical measures, or Safeguards, the IAEA verifies that States are honouring their international legal obligations to use nuclear material and technology only for peaceful purposes. Its independent verification work allows the IAEA to play an indispensable role in preventing the spread of nuclear weapons." (Source: IAEA)