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 0x9a2934eae4ef2735abe54cc5927a82f4dbf5a8fe0f3a4243bc4bdaeb2b1c5fab. 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/8c53c272-79ef-4cc4-909a-fa0ecfaea42a.json and https://artists.proofprofile.net/proofs/artist/8c53c272-79ef-4cc4-909a-fa0ecfaea42a.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 0x45bd9bbc34d208c88a430492a7afabd17b8790fd8e6de47b94ced37ac99a78b5. 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/CA5KR2505095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe415b9bec0aaf7d025e9fed05e4f7654a43441985c790fccbb03b83e2081aa6. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CA5KR2512190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa28448946650e54e36aaae49227dd45ecbd6f64fa58d33df79c4abcc57cea07f. 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/CA5KR2512191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797632be52ce0d85a17772e0a4ffb8f3b3438d771837a2b959e8362b8cd1ed2b. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/CA5KR2512192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062d2af1f494ee174962c1623daf5391391722f30dd69a6948c83c97b5dffb3a. 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/CA5KR2512194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe62c2b776b60eb1b7b9a9cdf74f291738c2bcc893f4f7a83b7a34fdcaf74f7cb. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/CA5KR2512195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e354d921124093bfdfbaafa8f34db8e88e7118d919c88312848d27ba12b2dd3. 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/CA5KR2512196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5da3d3e94748e9a0585eae81ce4fb4cd1b0046437d0f82535fabf317382d24d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/CA5KR2512197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9d886d3063f25cdc3d5cbd46248f0e478abf7c8d7a7b484afeeb4858e2f7fb. 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/CA5KR2512198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b4f0fec0ca8f3ac467466cf627336c37872f85f16aeb6dfbecc5a33bae5cae. 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/CA5KR2512199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e9e089b3b176c2a3c0f189c7caa3f52a8c57e0ede2ef98689562644a4a4cc85. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CA5KR2512200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4917225f31d9dbe6c6ef918576b30b07770f8b02f7d0f1b847f219c74a69c24. 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/CA5KR2512201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c84c8a27306ee9d3a78989caeff8f6c6f6d487c34cca5e597675dba3cf504b3. 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/CA5KR2512202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4f3fda28f17ab4c8a8af7b6675f8ed8e3d6490d6511f683c8777cbc428a004b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/US23A1590369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe832be19b06cabca3d7ef3e8d5999655539685a3d156a852b48870a146fe70fc. 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/US23A1590370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61238d85bb6bfb7a74fff9d8d236f4c2941823d07a3e75d09b18776588ddb93c. 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/US23A1590371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19c3cc27b11aa9e94f7d8e393818e83ffaea65362cfd30523128a492ea603855. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/ZBF6Z2400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df207ebfd937146ffd39eeddcbb6360bd5e5423b89e87b1f49c258be4bbe4f2. 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/US23A1579527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1ce6039e9242db4c7cd365e073e1613641e46d85178808bf45fd5b6c045c10b. 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/QZK6H2400158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2e5aa4bd33775752c5116815a54ddaece51e70af8ecea1dc2891668b1490fb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ZBTEH2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a6a528730d82874b492cc32e07f204fd68a0f1d5a5ba492c9d34968a1fe3000. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DGA0H2493816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1563c152570781cbce373adc0b1b54f9c7003f80118f0019b250b2b02dbdabae. 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/DGA0H2493817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ea77bdad249bfbd4edba7fe2e99247f69ed6016c561c6a3561f62682d5af643. 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/DGA0H2493825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f0f47694443697f051e851644c4b9ca71e12f912c956e953d632db4b400f526. 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/DGA0H2493826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5bd7372f8665844ad9ad7d6e72cd6ac40139c407c86399382a2b64c43b0d271. 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/CA5KR2505743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdecac59ac4e65773d01cd474c3ecb77703e2bdb586274e70bd2a9644593ec2e3. 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/GBKQU2498672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x385a9cc1cbeb945e89d8263fec4de34502c0e20911394ba5e88f7db13c8d0653. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QM4TW2537315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e58466b43fd5af57ea9ca3116bec2241b5bdbfaa2d687bea2eb429b49ad1a5f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ZBIAV2500000.