Opaque unique identifier Format – Prefix identifies the EIDR registry in the DOI and handle systems – Suffix is 20 hexadecimal digits and a Base 36 check digit – Other formats Compact binary, URI, application-specific Opaque numbers assigned by the registry Purely functional without any implication of ownership Remain the same regardless of asset or registrant ownership Central database contains all required data 10.5240/ XXXX-XXXX-XXXX-XXXX-XXXX-C Standard prefix for EIDR registry Unique suffix for each asset Check digit 68
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