स्व-रक्षित लंबे समय तक वैधता ★ लाइव

Qualified timestamps produce PAdES-B-LTA (seal → sign → timestamp). A renewal pass detects timestamps nearing expiry and re-stamps them before they lapse, layering rather than replacing — so documents stay legally verifiable indefinitely. Self-maintaining validity of this kind is rare even among dedicated document vaults.