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 0xd3abbfff8a560ba5b9ba19ab4fea5b23d21efe8000cba626f66bb178bf1a2941. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38ebfe60-70fa-4cf8-9a56-ce11131034c8.json and https://artists.proofprofile.net/proofs/artist/38ebfe60-70fa-4cf8-9a56-ce11131034c8.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 0xacb820d233fc80988cd62828f25c9ddc4feec9d2e71cc5afba7a00c5c74aa4c2. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZGWW1929205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ec5f34eaaceb0133766672caa7bfdb25b886ff05383939ecb0b8d8fe4b5623. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZGWW1929232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c3bdcffd721d6c5f9bbf96740469308a38f8da4ae74c0240ff4a8c2aa39f41. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZARB1886870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x213ad589813ac213a4e0469b9da9448fb4a022e22d086152dcb88617f3858742. 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/QZK6Q2291860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95733c9868f3047b6339455cac022dda5711fa8454f66932d69bf6a3b3f2afca. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM24S1846124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10ff505838e8bc92d01a24a38627c19232b6c88a563b0bfdfe08d0ca0f25edd3. 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/QM24S1846125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d67a4d5b6ed962f3581a4a84f1fe7ab8031bb2dbe130e41a8beb63baf43a36f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM24S1846126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3aceb17976f76d1db3f1cc24d580eca2dd424f97c0607ad234bd62b86c85c25. 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/QM24S1846130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0340e796de3db5e108ef53961350fc60b3c8e19f2f6cc2b6fcee84262571c63. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QM24S1846133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808c923a8e1f3ba6742fb5830cb937eb5c9d3c4719d7ff5d054cdfbbfde432f6. 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/QM24S1846137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bba392688cffdd2b9397ed607eca5419c4a41a054de2cfe01d2922f22be6f00. 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/QM24S1846138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84bdfe2b05ee9c213d2c9ccb391d313e1d92b1c145421b1bfba4aad78704f411. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM24S1846141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee4bd48b37bf4883e58306da3a0ff95f06869875cd1278f564de02507a612008. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QM24S1846142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5fcbe88a57a62b924a865b913f98ffdcc453740876e4bbf0b36c5043c39d3c. 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/QM24S1846144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6f954ac78f46f5916ef40c676ca1f013aaaf281304c8b278d73423ab8fd374. 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/QM24S1846145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8feea0f24963bb6a1fbfe9f3b6fd1430b07540ea2b8a847200b70e73f743984. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QM24S1846150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c8e7b663a678218c93148f6b161a60613b947cca2a67b34f038b9506d421267. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QM24S1846153.