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 0x8406a40e5c8f54791e1f1355cabf39ad555717cdec6c7c2fa14019c8a554e0f7. 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/5b9e32f3-da6f-4ea1-a0ce-baf91b19da9b.json and https://artists.proofprofile.net/proofs/artist/5b9e32f3-da6f-4ea1-a0ce-baf91b19da9b.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 0x17c6ad26121b1f208acb27d46d9b49f59fea16e008e93c33c16924230531598d. 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/QZDA61858314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8d3c2b280f41a1a29220f0683510db71b6254cbd6829cf114a3b87b7f45240. 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/QZ4JJ1828064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a42249d21ac82c86b2743c2a946d0d168b0df355c52241e537c583a43693021. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USL4R1936142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a42249d21ac82c86b2743c2a946d0d168b0df355c52241e537c583a43693021. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/USL4R1936142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a362768bf17abb29a63448fe57d78d2bc4b06f4ac4e7fac3c521023d189892. 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/USCGH2109225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ef066f23e0748dd3b98c458f972d49c3b1ea5a7338f910e8087bfb52b172c2. 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/USHM22073613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d50053037666afed27ae75c97648e57aea8e10ebd37dc9368491922031a7eda. 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/USHM22073621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79e41321da6f0f35740161e09099a1da45f35dbbdc4520b1a1c3955e5393f56. 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/USHM22073614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d293a0c8a8d791463cbed31b558d5b050f3a6fdfb0a8770e8a39a47d851155. 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/USHM22062985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7e3dda8dcbfd7bb71de48ca5417322e9a7309297f6407f9d0caa986aa020902. 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/USCGH2109231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77e29889dc4562c62a180f7e312f428b9112a26d92eed4f2b18591631b35c110. 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/USCGH2109234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf39db0ce85e0f9e1b1c7ca3c407ef21681ebcb16e38ddaaeb477f0954d46d44. 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/QZES61977676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3856cdab15e7e4a81894e3e22eb36630badbfcbb7339966399842abcaf03ba. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/USHM82206408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68fecc66f1e4ca56a40bdb1ce0de95500d8023eddc1138258b55060cf83fb8bd. 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/QZWDW2538973.