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 0x8c5a50f1c657b156d443cd9335ebe10c4ee7aa75ba96636ff7e647bdb4b8fc6f. 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/5f9b0530-208c-4543-8a85-d6b7c7151244.json and https://artists.proofprofile.net/proofs/artist/5f9b0530-208c-4543-8a85-d6b7c7151244.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 0x36bdf3bc8c0109bdd3027c34ce58318801d8bab2524bff7c0248fefb2ed633a4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCADR1859210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x686c864c1e8e26198867903b16e33e1e5fd88a1fd101e9afd300b65bea8c9ede. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/TCADU1838734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce640798c4e32da76d6df7f4a4488a1dae365050c5969acb9dbfc4709ab75f6. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZFZ62039381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffc9ac42e9e737e7d2fd14c01650f0d930ec7d9797fd6486e7ee2edcb34791e. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/NL5MF2101493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c9d77fca16b2710f3c1da1bd3a40f3f0c2e2086df8e0d8df8a4b7e8aba3e23. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZK6G2452285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a498ed6c730ea8349fb9556073c40043f2a79440990c06d56e0130c9273627. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZK6G2453185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5310dcb39727b16a527db568af351f9f49ad223da3d716da8501c6d680a9cca1. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAJM2546972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeda8710d2308e5448cfff1b98a44d75928d70d9efd5325f15930befafc657d43. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/TCAJR2547555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92fb4066c5fb14163d3abbdb52c7e4e233f6b579a9143652f183815165f2a43a. 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/TCAFW2139562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ed762ac7d1f637d228797217e8730ab8e816b9881939420d19531f0be84870. 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/TCAFW2139572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e21b5be7416ff07367606527ed0f4384ff64ee21eba58a680a22ee92ee2f0ad. 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/NL1EQ1900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5324fc9b4230bab2870e727516ebf372e671e8a857c21ee251431d01e003cc0d. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NL1EQ1900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf5c35c30677384af3e30e9e50d1a55b1c2dd8b698c3a7b7abd0346c2e869f48. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QZS632363182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80b6d48ce252020b8d6f88d41c4f5cc2d487c17301b1082580a189407777d08f. 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/QZTBD2385341.