The CBSO Chorus is a chorus based in Birmingham, England. Description It was founded in 1973 as the CBSO Chorus. Simon Halsey has served as Chorus Director since 1983. Between 1995 and 2009 was known
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 0xf9de6671966cc44a5f838ce1998212ddfe9861de6065016afc9f969a6d0f164d. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9c660c9-cdf6-425b-b293-5f5791cc4658.json and https://artists.proofprofile.net/proofs/artist/e9c660c9-cdf6-425b-b293-5f5791cc4658.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).