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 0x2a8cc9d39911ab5ee722537f9f56e94d0d4540a10ffaafa5d5dc520f1122146b. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91dcd3f2-1297-4c2f-8c80-d2ca3a66d9a7.json and https://artists.proofprofile.net/proofs/artist/91dcd3f2-1297-4c2f-8c80-d2ca3a66d9a7.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 0xd8ec3ea1b4176e7cfe932b6d551697ec2eed123c0e30038ecb368a56c0b55043. 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/US25L2300399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90287e275df09c44cae7c441289438d6db7de9d80c22efab410850cacaee54e. 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/US25L2300397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2de43a8cd857852e3c9c0c1c0f8cba9038fbe55993a8608d6dae0581d0e85a9. 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/US25L2300271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79763513921f9190741b29f6e31b52e178ca9db8ca974a9c91196e90fb2137f. 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/US25L2100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4373a0e4e7573da6215f26d24cb145637fb4554c692f0b6dcdf6aee746c7815. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZK6M2211829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2de43a8cd857852e3c9c0c1c0f8cba9038fbe55993a8608d6dae0581d0e85a9. 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/US25L2300271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf252da581bf79dfa72d82a2da4d7e623022df34cd15b7e8cddeb4c085a232771. 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/US25L2100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca9d0c9356b22fad0fccb6dba380377a02ee1aef36a97b460d89251e8d974fcd. 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/US25L2100049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc79763513921f9190741b29f6e31b52e178ca9db8ca974a9c91196e90fb2137f. 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/US25L2100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fc1b0dacd12a246ab951fe4150d31d287052fd4e60e2db904742eea05dc1b9. 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/US25L2200064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99e864653834d6f7d5201b503f49d21af01ce147bc4b9d7c056baf3614f967b2. 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/US25L2200073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x109efa9bbf10eff57c2d947c7ec88fcf9a43a62db14f3f4dedd5159e45a8a559. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/US25L2200077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78fc1b0dacd12a246ab951fe4150d31d287052fd4e60e2db904742eea05dc1b9. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/US25L2200064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf252da581bf79dfa72d82a2da4d7e623022df34cd15b7e8cddeb4c085a232771. 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/US25L2100045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4f122b8b9c659b783358bc3d729e491c476d4bc7f8c266f7e296212b68648f. 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/USA5W2300801.