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 0x780eebab7daff99effd13d941971c48041898204cb81893fc5309d0b381f2703. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff2cd3b2-ce0e-4a63-8fea-85b5830632bc.json and https://artists.proofprofile.net/proofs/artist/ff2cd3b2-ce0e-4a63-8fea-85b5830632bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Offenbach: Les contes d'Hoffmann, Act 1: "Drig ! drig ! drig !" (Chœur, Hermann, Luther, Wilhelm, Wolfram, Nathanaël)
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 0xb59c5426d65d419b8f61a416816e7293755c68f7526ad0f1a169054553d8578b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/FRZ209616809.
Offenbach: Les contes d'Hoffmann, Act 1: "Bonjour, amis !" (Hoffmann, Nicklausse, Nathanaël, Wilhelm, Wolfram, Hermann, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfad5d4af0e17dec99f870767607e9838753da039d73b1253ff852265e7b339a8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FRZ209616812.
Offenbach: Les contes d'Hoffmann, Act 1: "Vrai Dieu ! Mes amis, la belle créature !" (Nathanaël, Hermann, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902f0c72d79413a4727e478f4ea84f6e00085c1f6a92da258513dd5eb02b24eb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/FRZ209616810.
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 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
Offenbach: Les contes d'Hoffmann, Act 1: "Eh ! Luther ! Ma grosse tonne !" (Nathanaël, Wilhelm, Hermann, Lindorf, Luther, Chœur)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661cbbfbc818b62bd5a5a6b2b549e0e979d5cb8cf156a8a35a8febb65a3234b4. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRZ209616811.