Physical Graffiti is the sixth studio album by the English rock band Led Zeppelin. Released as a double album on 24 February 1975 in the United States and on 28 February 1975 in the United Kingdom, it
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c467f37e422f4ca4b3d03639fd6f5abb8172cd8727d30a73ad46ddd90a37236. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/68e38b4c-4cb2-488f-b234-a8b39038557e.json and https://artists.proofprofile.net/proofs/artist/68e38b4c-4cb2-488f-b234-a8b39038557e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).