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 0xb4b8d788b10c7e1cf34f8c7d17f62d088b68d9ef1854dd1e58a935d7c82817b9. 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/ad8993b7-4aa7-41be-8cb7-b809be89bc1e.json and https://artists.proofprofile.net/proofs/artist/ad8993b7-4aa7-41be-8cb7-b809be89bc1e.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 0x813e5ecb2dfd24cb43bd804028f2c9650f1ba5532d97cc9061e54d719028030e. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/TCADU1856227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x361d0b5fd91151048228b9266b8d8818a1e9751f8ad346288919202255b5b684. 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/TCAEM1983059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5e9b2bbeeff30c71671617765dcc792181b603433e2be40f9d75158e04e7bb. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/FR9W12233676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa960245b738546902dc81233c62b6fa4130ced24faa0bb7d656f5a563aacd19c. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FRDUQ2300510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a3902f1f680d2d055d29eb7760c5db574e55ecdec34dae21215b378e0956d21. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/FRDUQ2300520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ebf578409cebe21ef872af12144aa5c3ec3b9f39534229e37a6fad03b0b29a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRDUQ2300540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1452e96bb10a8c35fc1b413e3a0290c018cc6a9a3c1a6c9c75f2f443bc3f048. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FRDUQ2300550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcebd660965aa347c8b9b1351c02e3d0c384b0b62bb4efe5c4b6705c10083b6. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/FRDUQ2300730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76b91f562e18a4e8d2e08d04b525e2ee29180ebb7f0b2338f718d0c81bc63ef8. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRDUQ2300760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389addcfe2856cf8ab0186e0136ca1e6670b3ea47df6f31f556c53a516b9aa7a. 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/FRDUQ2300890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389addcfe2856cf8ab0186e0136ca1e6670b3ea47df6f31f556c53a516b9aa7a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FRDUQ2300890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9720ec2446ac3849f1e66160c51bf92140b5ba01c45041b5d2f11ad1fbd513. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/FRDUQ2300910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50395e4dd91bfd398817f6dc6ab85f8ed2a4395ae26871fe6a5eae4aa0116619. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FRDUQ2300930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2ed4b1e30f6f582a6789cf005c817f56df2f34d66f5f6c9da073ceebd8f1e7b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/FRDUQ2300940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf63b2ef42d604eef0456b2db9e6ac400a1ad54f2898392c88693f53032bec66. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZGLM2524475.