Big Seven or Big 7 may refer to: Sports Big Seven (1938–1946), an unofficial name of the Skyline Conference, also known as the Mountain States Conference Big Seven Conference, later the Big Eight C
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 0x760c1dae3d8e926f7fbc7d51da6d7ce79e345fb537c90a87dfd007445ceb898d. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aaf9a5d0-59be-4885-bbea-8ce33dc9a98d.json and https://artists.proofprofile.net/proofs/artist/aaf9a5d0-59be-4885-bbea-8ce33dc9a98d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).