Batch traceability (Super admin)

Internal audit view for a batch leg or full custody chain (TC-XXXXXXXX-*). Public consumers use Verify batch (no login). Use ?id= with a leg (TC-XXXXXXXX-YYYY) or ?chain=TC-XXXXXXXX. New captures use sequential anchoring: each leg’s data_hash embeds v2|seq=… where seq is SHA256(image_bytes ‖ UTF-8(GPS) ‖ UTF-8(previous_leg_data_hash)) (first leg uses 64 ASCII 0 as the prior commitment). The page verifies the embedded image SHA from IPFS, on-chain payload membership, and the sequential link across legs.