This is a reference client for accredited manufacturers embedding Tangible DC coin tags (NXP NTAG216). It reads the physical tag over Web NFC where supported, or accepts a manually entered serial, then calls your signing-app API. Signing is atomic and irreversible: once a tag is signed, its writable partition is locked forever, even to Datachain's own admin tools.
Issued by email on accreditation. Stored only in this browser's local storage, never sent anywhere except as the X-Manufacturer-Key header on your own requests.
Checking Web NFC support...
Web NFC requires Chrome for Android over HTTPS, and a user tap to grant permission per scan. On unsupported devices (e.g. iOS, desktop), enter the serial manually below - it is printed on the factory manifest that shipped with this batch.
Confirms this serial and batch belong to your own manifest before you attempt to sign it.
Signing is transactional: the writable-partition lock, the on-chain DCNFT anchor, and the first custody event all succeed together or all fail together. A failed QA check quarantines the tag instead.