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 0x96cc47f94337cbe4ed89938dbd6d97a97b56029f3c9849f45280e51516c39be3. 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/d2978eda-00e2-45f5-9e73-9fb389e76f7e.json and https://artists.proofprofile.net/proofs/artist/d2978eda-00e2-45f5-9e73-9fb389e76f7e.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 0xbbc2e313791619196040ea5f8dc318d15a081db5d1367eaf752f97c6372ab1b8. 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/PL84L2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34ab19f3cb30a7bb820ea094e94c9837129e04c0429254aca7b563d01c76e6b4. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T18:01:47Z), 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/PLC062518907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ebc6bd723e894d9d7f17f3b326e9002f31958a68405384ee6d64d13ff02cc6. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/PLC062523964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07094d717dccf131357a985433ba0af3fd095b5cd0f2c9f67e3e170a84db861e. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/PLC062524591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5865b5be596842c20ac7b724382ff756c2afb0fad4699ba055766ed936dfd5f7. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/PLC062524592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b81d67b536cb0b039d3b407b0954a1ca34570915535a74969590fb0bdb6b5d. 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/PLC062524593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1705c170e85b32d7171ca1f75afbd9a62a4e4ce2194a286c16a4424d15002e9a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/PLC062524594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14ebc6bd723e894d9d7f17f3b326e9002f31958a68405384ee6d64d13ff02cc6. 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/PLC062523964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1236159e7871588b14f04439e802357eb128ddf45b39372230cb16b7daf1be. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/PL4K02501806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b495d27573c83862caf66f9e2d2b80319132d29d68ef588c4dece915853408d. 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/PLC062421665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc19a8b6de3d755ad032736a626d372570cf06cc6eb104b93c7220d29c95a838c. 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/PLZ582300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb3123ce65cc2d1bde2b1140589aa8ae021cdc76d4d619f6e1a979fd09cd02d2. 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/PLC062404395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd0e657e9b6bd85ad48b9703b3546f8dfd7e5cf0fdbbe305e8c0653c9b8a724. 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/PLC062413245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5966960c42a6be0e2ef782919605c90d6fa59bc19e9ef612bb0e951eec4ea9df. 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/PLC062387642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7696b3f6a1eed570a687fe3ae68b5e1775828c7373d0117e69df0e8ea936ac2. 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/PLC062394579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4038a5f399b199ba82aa796d59a694134330479cea969500d76e20921b853242. 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/PLC062414207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21954058f19bf9fec97b194740fc758a03d245ec046c4fc703f07c6b6dd6cd7c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLC062414211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x500077641b1e77c69096b557bd98752503dcd348b20702b49dc4dceda73ebe77. 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/PLC062414215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66515ae08f838a436a56f3dd48cbfbd363827bccd625dcb3046b2145a576288e. 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/PLC062414209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6f7dd927579c7b4b0a05531321d804eb4ce4f03bf537e25b64c878869b9434f. 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/PLC062414210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc36496d729e9bf07fea69f9b7b27232c46f6e2f7bd4bc17bbed92810faa301c. 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/PLC062414214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68caf6a027b405069a5efbc4a306b59dd9b5caad5d17675d637147b209e59dc6. 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/PLC062428292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68caf6a027b405069a5efbc4a306b59dd9b5caad5d17675d637147b209e59dc6. 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/PLC062428292.