No. What is stored on the blockchain is a 1-way hash. This makes it useful only for verification; i.e. you can hash a certificate and compare to what is on the blockchain. And given what is on the blockchain, the original data cannot be feasibly recovered. This makes it easy for a recipient to reveal a certificate only to intended third parties.
Yes, the blockchain is an immutable and distributed store of transactions, with each block building upon the last. When a certificate is issued, its data is compressed into a hash and logged on the blockchain. This generates a “receipt” that can always be checked at a later date. The verification service validates the signature of the issuer and the certificate data; it also ensures that the certificate status has not expired or been revoked.
The blockchain verification process ensures that the certificate you see wasn’t tampered with by comparing hashes with what is registered on the blockchain. It ensures the certificate wasn’t revoked through a convention that relies on spending transaction outputs.
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