Check a week before you take it on
Three questions get answered. Does the issuer vouch that this week is real and carries no unpaid fees? Is the person offering it actually the one holding it? And — if they showed you the document — is it really the one behind that week? No account needed: anyone can audit any week.
Everything runs in your browser. The issuer's signature is verified here, against the issuer address read from the contract rather than from the file, so nothing rests on this site telling you the truth.
Reads the right from the contract and the issuer's attestation from the issuer, then checks them here. Use Verify JSON instead to check files a seller sent you, or to check the ownership record itself — that document has no endpoint, because only its holder may disclose it.