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 0xdf946474b7aee6dcb3d88a20e53ab0e7eff0743496432c06a313da0d7827e5d9. 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/66b256b7-1aee-4f5b-89a3-1d76c43c94bd.json and https://artists.proofprofile.net/proofs/artist/66b256b7-1aee-4f5b-89a3-1d76c43c94bd.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 0x47671c6c9ddc4207cf3205760ac530accffb07f77783ce390f5b2ce868aff815. 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/FR9Z62400617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae27b49aab795cb7e175580a2b924ee532fe740cf495015160e7e1ef5f7ae3f. 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/QMANG2231363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68610257f5382cebd235335ffdffa2a22c45436b8fa4ed223b98ad21a4c12111. 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/QMANG2231361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb7173dcdf8b698ac3764a9570a4f1775c6e935fc43d28710228ffadce63749. 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/QM3DF2267531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a4a2b50f796ea85ce6fa33586bb01cb51d3b4bf084091d01e2c4d23b8885c7. 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/QM3DF2267533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24dff991b8ae70c3f61279e0c0cef781525f11026764daf112054955b08e0880. 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/QM3DF2267534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf058dafc449dc47f559896a5a5302727a303e45a211b34f2f0cfae30e09c5004. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM3DF2267538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61b0cf722b8c0ad8ad206071b9bad3b7a37df831f1665a236d3cf14448f95d7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QM3DF2267540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa71486629e1ab0ed5a9945eaf78e6557e7cd24cf26a4067d1bc5908796468889. 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/FR9Z62400612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeaf1db913e1bad937ee9bb2bb6b55f8744e7076b21a4892daad5001ae25ede7. 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/USANG2480143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedabcac07ffce082b24b98be909efbf220d8350f86384132410e262e5391b0eb. 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/QMANG2231360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f07e7e97f27d5a292757cc314ff4bfff71bf17d993e5f8775a657ee5f12a996. 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/QM3DF2256954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1645dbfabf703939d0e154e6f77dbb6daacfb7e31038a63a3387b4e156038fa1. 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/QM3DF2250425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ee223f3264e3afc3aa23eed5c2755dd5fa1256583da50c0cdac6ab3519e3c8. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USANG2295415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40b4fa741ae8a3b1b91ff11f38441a3b97d928ebf93bda6ab4e5e3d367cb4c9. 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/USANG2280645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17df81f15c7cc6ad88399e2a14f8d33f1c93399623c453c22a29e706bb7c3fba. 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/US3DF2253727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926dd43bbe83821193148ac2aa524e8f41d226dde14978f12d05f1b0896f677a. 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/US3DF2253728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ba3765d5765ce748152faa898418ec8529a7e11578aa60ff37cc43003942531. 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/US3DF2253729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0aeb8c465fb61432d1cc40cdaa489856562ba1a0d4d863f37b1c4bf2eacb1d. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/US3DF2253730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51122c672be6fb4d88c53193273521c03396ccf2dfde426cb1a1a7d5499bc64d. 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/US3DF2253731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5a44de1090e02ffbc5ff4e094774db65f6b053fcf9527b87c2c060678d91c7. 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/US3DF2253732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a37385a18da42e1531d5ca34198467b8e8ff3498044da3aac1b8aad9adf0447. 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/US3DF2208474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63178ccc3844ce0c3e3f26b5afbfe3e6d8aa79198a5fc91b2a72a1a1980367f4. 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/QM3DF2102666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fded5b7a9960a88086da5b2d22bb2d5568486e9bab1fa57f8a6e57b07d6fc8f. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZMHN2097704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66b4f7f2181e36f1f73ef96614f1748b75264164e25b10b2f5ce1ace2b2cad24. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZMHP2055460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76dc3177459f1ffae1d5c93c638f5b50e8b1c03792c1ac3fc2ef6670d21e935. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZMHK2049734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe327c4f3bc7aa994e81c06363f9e70460db9f50236742c4081ae0f42071fcf5. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZF8N2176908.