Technical requirements for TAA to certify UTC-traceability
Japanese Industrial Standard / Japanese Standards Association , 01/01/2019
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JIS X 5094:2019
defines the functionality of the time assessment authority (TAA),
describes an overall architecture for providing the time to the time-stamping authority (TSA) and to guarantee the correctness of it through the use of the TAA, and
gives technical guidelines for the TAA to provide, and to provide assurance in, a trusted time source to the TSA.