Verified Documents
Documents published by SII, each with a digital fingerprint recorded on a public blockchain, so you can check that a copy you hold is exactly the one we published, and whether it is still the current version.
- Published here. We publish each document on this page with its date and version.
- Fingerprint timestamped. The file’s fingerprint (not the file) is timestamped on a public blockchain through OpenTimestamps, a free public service.
- Check any copy. Choose a PDF below and your own device tells you whether it matches.
Check your copy
Received an SII document from someone else? Check it here before you rely on it.
Nothing is uploaded. Your browser reads the file and computes its fingerprint on your own device.
Certificates and accreditations
ISO 9001:2015 certificate for Scientific & Industrial Instrumentation Pte Ltd
CurrentFingerprint submitted to the public blockchain on 2 November 2026. Confirmation is pending (usually within a few hours).
Technical details
SHA-256 fingerprint0a1d6a58e48ee93980aec5b4c5da2bbe65a21258e5d5a680cd821f336f78e407
Download proof (.ots) · Verify on OpenTimestamps
To check independently, download the document and its proof file, open opentimestamps.org and drop both files onto the page.
bizSAFE Level 3 certificate for Scientific & Industrial Instrumentation Pte Ltd
CurrentFingerprint submitted to the public blockchain on 2 November 2026. Confirmation is pending (usually within a few hours).
Technical details
SHA-256 fingerprint61525816ed0832baee9590f5b8ff60ec7ce28e05630100425a90ee008a51f6f2
Download proof (.ots) · Verify on OpenTimestamps
To check independently, download the document and its proof file, open opentimestamps.org and drop both files onto the page.
How this works
What is a fingerprint?
A fingerprint (SHA-256) is a short code calculated from every byte of a file. Change even one character and the fingerprint changes completely, so matching fingerprints mean identical files.
What does the public blockchain timestamp prove?
That a file with this exact fingerprint existed no later than the time of the public blockchain block shown. Nobody, including SII, can backdate or alter that record.
What does it not prove?
It does not vouch for what the document says, and it is not an endorsement by OpenTimestamps, by the public blockchain, or by any organisation named in a document. It only proves that this is the file SII published, unchanged, and when. The certificates themselves remain the responsibility of the bodies that issued them.
Why are some versions marked "Superseded"?
When a document is updated, the old file is removed from this site. Its fingerprint and proof stay listed so that an older copy can still be recognised as genuine but out of date.
How can I check without trusting this page?
Download the document and its .ots proof, then drop both onto opentimestamps.org. It checks the proof against the public blockchain independently of this website.