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 0xb4c075e2577232b553c1e6ca21b9997b112963a9740024f6c8cd02c2ee40aa6b. 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/31ffbca3-7f9d-4975-bacf-02037409bdfe.json and https://artists.proofprofile.net/proofs/artist/31ffbca3-7f9d-4975-bacf-02037409bdfe.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 0xf29b6c2e02310883cdeb9d870593943838a55e2945d478ae40bf95ca39ab1827. 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/CA5KR2373545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc36cf9aa8e332f07434e32f2535833cea0af2dfab336e722ff3ddfe4b55201f5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CA5KR2373546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e471c3a3449ea43a34b61bac40c32eaff7321cf89eca3d1432b0f4187c6b356. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/CA5KR2373548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e268fd6c547ebc6b1a0a7a39345ac28aaf50b64aaa271125a8e05277881bb2b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2373550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa71a65e83eee6ddd68ae95e5407e2a56f8aac06a011186b7041326f0927415. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTGW2401862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d9d541dd8570fb05c64f355666cabd2c616f53755b457ff2fd3a61c500526e. 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/QZTGW2401871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2a66c2bbe4c3508a001d28fe0efa89731a6902f95b6b17159ae4f56d84d571. 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/QZTGW2401841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d3cc61b9a2fc65d8a63de36f6d63af6ef61d0dfc5d944dc3a69790b7181d16c. 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/QZTGW2401852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b51234d99d0c1a73407721a459c464205e8988eb4a4a54abef5fab8077ca88d. 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/QZTGW2401825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bd41e10c13e68ddcead09fcac50d220bcaee17c79f4c6c498b204f4dc95f0f. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:45:00Z), 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/QZTGW2400784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5418da6cb6d540c95dec761f31edc7d9343c1d7b7d6b284063935ce23fc99763. 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/QZTGW2400601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d4e6670a78a2f9580379a5583a4bd0185c6525401bd99700e89957047d121d. 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/CA5KR2445538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc011ad031f92c2c8d9c77006ef6703b9bdffadfaebdd5a3c23c2137c49360210. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2445541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13d220867f68f72311c8cf2b8eb81759c18ae9a4d751acff018e26075bdf827b. 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/CA5KR2444622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5e9753170ad7ba992afa37e5d9c3e60887a8390e55c713485c18bf38bb544f1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2375151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2539ca7833b86ae936960f39743327d07acc2ca673b7731ae4dae9f08556e4. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CA5KR2375139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80672c48827b9a1d5fdc2263db81a33c74abb1367b6a961031262547927dc0e7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CA5KR2375136.