72 may refer to: 72 (number), the natural number following 71 and preceding 73 One of the years 72 BC, AD 72, 1972, 2072 "72", by James from the album Hey Ma 72 Feronia, a main-belt asteroid Ta
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bbd5f22f5747f9d488451bf0926687d501c4dd2d18b592220d2b7f8db2f4ee. Chain 2 (Bitcoin): anchored in block 953602 (2026-06-14T06:58:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f9c57fd-36b8-49a8-98ab-d5db7176889a.json and https://artists.proofprofile.net/proofs/artist/0f9c57fd-36b8-49a8-98ab-d5db7176889a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).