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 0x485bf944b1537fab07457ad7eb5abc4ff5efeda8439ea526ab7569f8f20967c1. Chain 2 (Bitcoin): anchored in block 953733 (2026-06-15T03:12:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/96d2e8ec-3602-46e1-a873-3f247a35bb1f.json and https://artists.proofprofile.net/proofs/artist/96d2e8ec-3602-46e1-a873-3f247a35bb1f.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 0x5cf1a2add0faf1e7b61d4490a2b81afe3d07f947e1b8d069e54dac7b401f3f56. 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/GBRKQ2343960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c6f68debfe3a6a621023c1efa947987ce6c1c36f15a73f33da6f610d6be737. 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/GBRKQ2343975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d5302b5b3523d7fd31532db2558c7ad75a542f811ec7afdaa12d1343a77a35. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/GBRKQ2344000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30cc02d60ae62a301ed87bdf9545acbe1cc1862f7097bdcedaed9fd2b18bd94c. 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/GBRKQ2344010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb029ca64d38f5feb81cf87e4ebed5839a713053fe0e27c04a0881f6fbd9307c. 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/GBRKQ2344013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa10932fa7c4d30fb2412c68019e82d5ef4917da4df7ee7d6268ad67bad4212a1. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/GBRKQ2344015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x076020b702eb9dcf6607785e737221823596670d0c95363496e76aaf8c5a83a0. 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/GBRKQ2343928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15e4da77f9bbeebc955251cac89311958701aa4e3121bbaf429bc2b7451451c. 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/USCGJ1835699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5009e6e4129e58da0d4bc11d7259a0df128b6835e695cad146a6fde3e200b84. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CH6541731217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddb54e19959faf8d7e0e80a7bb5b6e0c88f4e55a26b7be20f01f2db7c97e028a. 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/CH6541731220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92fd89c7d605197c8971583ef13f4a5bc8b13e1d17ffa34fbe1fec33fc171a3f. 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/USQY51722634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8714bcbbfba354961f1714f9d004113baf7737578407883b1de0fc4e5f9117bc. 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/UKF6P1600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa96fcd96289085141fdb07dc1ca1ed94b9a61d9c85a25a1d3d1133183a066720. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/UKF6P1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9305dfc80f5e2f69884e1154cb3df2efd8c20b04c04a3f05cbcb42d1cc45736c. 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/USHM21761868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727bc3d27d00d684443541e2ac3c3dac0fd70cb67cc63eb172faa2e16a834f3c. 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/USLZJ2021034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa745c4864ae9c6b5b594a66abdea8b38e07a6690d58b324b859d2fb71ccf58. 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/USLZJ2192267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c84b443fa3aba367e45e3ef25a35dd6c857ac6a18648eae3455df1c7a85bf22. 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/USLZJ2192268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ade2100094b6225e405ddb06c0ef8e33b54953c306eb852243ccb604696fb5. 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/USLZJ2192272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d97449d6def791df67fbd49226d34e6250dadf23c46f23074f0ad27cb92fb1. 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/USLZJ2192273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff17686a66c85ce12644191e4e1e4b27d29f808c2997e64b2b3d4d6301ae2d1. 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/USLZJ2192274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb562f8e73bc8e4fcb15c50d2f7707e140010a5d5bc37d385bfd529e6e84e8a. 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/USHM91779934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15e4da77f9bbeebc955251cac89311958701aa4e3121bbaf429bc2b7451451c. 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/USCGJ1835699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27132baeff4b66ac91d90898c13631076c9130f59a679bfeeae2750a342433e9. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZNWY2171405.