The Royal Concertgebouw Orchestra (, ) is a Dutch symphony orchestra, established in 1888 at the Amsterdam Royal Concertgebouw (concert hall). It is considered one of the world's leading orchestras.In
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 0x0b95fda6134d55bb3fe8b55ee40021f9f8dc880e9ab6786acaf9f784ef67c54e. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b5324b2-139d-498d-8298-59b112c21eb0.json and https://artists.proofprofile.net/proofs/artist/6b5324b2-139d-498d-8298-59b112c21eb0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).