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 0x0041e5ede0b72feb776dc827f3310200ffd5b336163fb5cb177aa5da7de92c8e. 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/84787092-2058-4282-ac32-a9017582eefa.json and https://artists.proofprofile.net/proofs/artist/84787092-2058-4282-ac32-a9017582eefa.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 0x810911d15e6c89f86c538fa04553b5363cc6e1e132bacb613ee8d64edf3ee181. 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/PLA552300929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7281d5ab89131059b65eb0d72efe94add248753fe2887585d9309414fa785774. 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/PLA552100838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3a7179c74ccb2a65ec79d2cbe685c90b87ce9512fce979c3d02e4ef5917f2f. 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/PL59G2200310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7281d5ab89131059b65eb0d72efe94add248753fe2887585d9309414fa785774. 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/PLA552100838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedab92c1d5f516def9684022c8b87dcac4b0cd39ea4fb26269084a5fadcd4653. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLA552400739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f1756869831e72b6dff21702d6169a261895ade0ddf5a72e87ac7572f4bd6f. 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/PLF242208812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06c202635af8d481cc4b54df460145846cd043fa33c203ba4c5b3e1b79fe4ce7. 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/PLV402101541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f3d6e99f281e2193a8d70b2d35ce4446e14a922c4ccdc19814910f8c487ac1. 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/PLUM72300128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5cda1210faa341201e9ad704a313f1c256267995440f6e7c1807b0485b27ea. 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/PLV402101109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc203d12bd8d5fce335a901356814f3018f8aafba3b4571388e9b5143ca0f3b4a. 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/PLV402101110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d2d0534a3ffbae68bb8e76d71569a57af65f4ee9a09d03f770e8c9844ec445d. 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/PLV402101107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fd703cc3a3c8d1062e5ac1d16609790e412c470e56eef90aca93a22a5676d3. 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/PLV402101120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8f455bc7c971018a9087f2592a1ca6caf7f162d25ac335d97dc228748bac806. 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/PLV402001040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b75a67f0581229e26448c13b4453a1d95df4cbfd37a5f5d2cebad3f84dff3a8. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/PLV402101123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d730fa9b26c7bec9b674cdcdbd5db7deacdd045ddda8b827d784978fc53f89. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/PLV402101125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x510fb4567562edded2e9553432ccd85ef2c9e25ffb5a0471ccd3640d10f3a6eb. 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/PLS412400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c8b5d61b2d07cc065cc211d0853d831f244f51fa2d3ebe87f305f9ed0cc5761. 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/PLS412100012.