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 0xd5382fde38b70f4ef715de82a74d0437e91384185b5c20b949f23c646ee60168. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b654aa3a-ccdd-448f-9b34-ed61abc828c0.json and https://artists.proofprofile.net/proofs/artist/b654aa3a-ccdd-448f-9b34-ed61abc828c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
String Quartet No.7 in E flat, KV.160 I.Allegro
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd21993feaeb8b309ef76634277fcd644352dd3fceba1add0b10213e41c8641a5. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T11:31:58Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV1969229.
String Quartet No.6 in B flat, KV.159 II.Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3cc39c6861d52213bfcc657b0eca6355db0e7777f6ef49450f5d203e76864f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV1969231.
String Quartet No.6 in B flat, KV.159 I.Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x156807ba44e5caa3c6e7e23ba5deab3a0af1728dddfdc589472fbf339c97729d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CACWV1969232.