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 0xa4467fa39e25bfe69f522dbacf1b07ed8cdf0a2f32e991b306868dc2781b272a. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2353699b-09a3-41df-b31c-3c48106cb66e.json and https://artists.proofprofile.net/proofs/artist/2353699b-09a3-41df-b31c-3c48106cb66e.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 0x8f80749ed5157190e2b1f5340764bb0edd4c57245a38874d82ed5b53900a8258. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR9W11524916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5f05fe50ffa33377cac0c1d7f4dda0e64a1019b4d1b1d3f146669bba2fcb15. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/FR9W11823999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dd59280e3879710ab06b742ae6b117c24eb3a4d003e2b7f7a217f9d9908773d. 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/FR9W11824000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb0c5c130df3bf1a6fadc38fc2160cb5f55295ef3fb6a0e3f2b18243abb6d40f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FR9W11824001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4f8f5da9c471281e87ab7fd1fdd5eed9b5614fab72687dc41605e94f14517a. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/FR9W11824002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf199714229580b9d5b8a33df346622a4ffde829c5bb2f78a4bab28ed97ccb98. 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/FR9W11824003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd845a70af428bb230a578c2811f74bcdbc08e27a3e31f1fcc4be40e8af958e. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/FR9W11824004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6309c0f060ea53ab576394a7ee3b3ba5f528d0bfd235f64938a1dac2debf527a. 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/FR9W11824005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad0bab2accd652b38f56bfe68603cb7bd3ed403c3e15003f7f8a8e21fb408cb. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/FR9W11824006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27efa51cb7af3145e80d71e28abd2656ddd2cfff4f709b7f8335be39cd564e7f. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/FR9W11618411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92130c50ca9fa45f29d7ac2aca721fccabdfbb3e4c5435f98519c780bbf4cd0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR9W11618412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40224b1d0de1c10b9c96342dd65334e8df86f7e5969005be5942e98b167ab6d8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/FR9W11519547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x861b268b52bfd007db8760173191e7e6adb7ed651a7abd63223d8fb1a9f58aea. 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/FR9W11618413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaa0010fc3ac4e52d0a1592b1fef48fbb0ea54e1fcbe140ddaeee87365b86cc7. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/FR9W11618414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2c8f309422018b153f4f5692fd4c08e9ecc2b61d59b8d367d515d42c13edaf1. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/FR9W11618415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6819afa0a8d3f4f3841976e06217d4e0807cc382d778d3c23bf51eee1dc9a5e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR9W11618416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccdf0c2a306eaf73f4d4b4bd5c5e4d3505d7b454c08753d501f5ec9242edd262. 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/FR9W11519546.