Symphonia (Greek ) is a much-discussed word, applied at different times to the bagpipe, the drum, the hurdy-gurdy, and finally a kind of clavichord. The sixth of the musical instruments enumerated 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa9a74db0d142e4a1ade2515b7fb16673d65ac42e7b41640fe428c7d65eb277. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cccb0b7f-72a9-467b-a8cc-59cacee0003b.json and https://artists.proofprofile.net/proofs/artist/cccb0b7f-72a9-467b-a8cc-59cacee0003b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).