Electronic authentication of GST notices determines validity; unsigned adjudication orders lack legal existence, permitting writ relief despite appellate remedies.

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....Mandatory authentication under Rule 26(3) requires every electronic GST notice and adjudication order to bear a digital signature, e-signature, or another notified verification mode. An officer's portal login authenticates access only; it does not authenticate or attribute a document's contents. Electronic documents issued without a signature or notified authentication mode lack legal existence, and the defect is jurisdictional rather than curable. The unsigned show cause notice, adjudication order, and consequential recovery action were set aside, while fresh proceedings remained available in accordance with law. A statutory appeal does not bar writ jurisdiction where the challenged order lacks legal existence.....