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 0xe369d8c896cf6c078d6b40a1e19954d89c10c252f4edceea734ee38383055309. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37292f14-347e-485a-9261-41c80ff6e213.json and https://artists.proofprofile.net/proofs/artist/37292f14-347e-485a-9261-41c80ff6e213.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a5ae2101426d1df14a93ce2d58a3e9085bc9de92c5e1ee58d437acfb9c00a4. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:39:17Z), 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/QZES92269592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd42ec0e5a85c6ff1fbf0c0ca53622f24c7e3bd6921f72217a7aba9b0b72e360. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZES92269594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4b21895ad06e5cb439548402cfe0d4e1126a325356891b2291779dcff76c1c. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/QZFYY2461440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d6d64461a4ec745d1a099475c816f74a08bf98e6c702d4b2626b574bcc918d9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZYFZ2417821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c333ea57a1115e0105866911795ede9a1e01efdf02eedf91f05e29db3b7d421. 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/QZN882420560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dafc6328c1b450b360470d62a310075477bfe76566b381234ca554222147aa. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/QZWDW2479250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d438f0af5c6f5aba282ae6b0142d2fc35a503731e5977a53dd1e3d208f7c5f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882427081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dafc6328c1b450b360470d62a310075477bfe76566b381234ca554222147aa. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZWDW2479250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7122df91226c0306a6738420cdf1521e7b5bee6bdc837d564fe8cdb39c853195. Chain 2 (Bitcoin): anchored in block 958432 (2026-07-17T15:43:17Z), 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/QZN882533031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d438f0af5c6f5aba282ae6b0142d2fc35a503731e5977a53dd1e3d208f7c5f. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZN882427081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8d412fa5a115b9ed52069117fd84985961ab0fa1847f0c315da5d36e4b4ec3. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZN882588798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7122df91226c0306a6738420cdf1521e7b5bee6bdc837d564fe8cdb39c853195. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZN882533031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374667b669409445795935837ca8e71ced4757484f2a4be37acf87beae1f7624. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZWDW2576140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x374667b669409445795935837ca8e71ced4757484f2a4be37acf87beae1f7624. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWDW2576140.