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Version 3 of the GUARDAID extension registry (registry-kind 3). Governs extension fields 1000 to 65535, entry and exit criteria, must-understand versus ignorable evaluation, block allocation policy in increments of 100 numbers from 2000 onwards, and allocates the 2000–2099 block to Annex 4 with proposed field 2000 (firmware-attestation).
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Fabiana Andrea Gómez Martínez (2026) studied this question.
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