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 0x2dd3d4b71dcb9e61441698ed1b23d80a239906174ce425f9c67ee7b6e51b3f71. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/733447af-66af-44b0-8e0d-9cdf0277da13.json and https://artists.proofprofile.net/proofs/artist/733447af-66af-44b0-8e0d-9cdf0277da13.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 0x403614d3f29bd8fb4e7c823a6c28182246f95bd304e87ab0deb6a2999c5c05e6. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USA5R0457701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc72827474c3aeae1dadf150ac0d3fd9cf4a698511ef473c2aaed2f391baa3f93. 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/USA5R0457702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8550bd2fe729b7ed27b69edc36da77759dfa9af18b9a1c6a3b40be31b08877ba. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USA5R0457703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee44e8f76fdc216acd3b9a1e2eea014cf6b075c506799b016c8af2b2c9b8b592. 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/USA5R0457709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfc7700111142d1a0866968a6f11a448d7581beee129d1d84c2f4921d340bd5. 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/USA5R0457712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f84a91fd22c57f1a8bb1b1e132387406bc0a384f8892c449d68e4c52c91b1b. 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/USA5R0457715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087a82debad384df885999aa51e93e76933247449cff18d12ad91ac8ebf84736. 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/USA5R0457716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc644822cbddcd6b9a2e4c8039b9423c37f5e1028b9622ea13752c711994e114a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USA5R0356501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ed23b327e77ea91a86f6ccd26032fc982b56589c23be8c4433c546ff3768ea. 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/USA5R0356503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50c10432546e1c015e8cb88ebad8b5ba06539e48ed9bd59dc45efd8b05b02a76. 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/USA5R0356504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71a941d1534fd9696dc1fb77c6b3e0f33c6a04a7fd1d54e28d3ac1f336eec22a. 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/USA5R0356505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1dd3a07b077fdea5b3320cf69d0fc5416e8c4f8000bff7039a05eda46d7b093. 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/USA5R0356506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05d64f84111293dcb68120cfdb6736b415ff69554b377f13cc296d38faa0b1e. 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/USA5R0356508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59402b3640453b65070c9a611e448a220bffee5011aa0709620296a22b456ce6. 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/USA5R0356510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0cd3ff6cc92c6dc6a59ce96e94d9605911afe547719ac42aedb8295e802ad3. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USA5R0356512.