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 0x1fbff97d5844082c0c75d4052eef176352b44b7b746b5b3da0be57b294e682e5. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d8c2777-9139-4bec-8a52-49b842894c22.json and https://artists.proofprofile.net/proofs/artist/7d8c2777-9139-4bec-8a52-49b842894c22.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 0xd201afc9e659cacc88fb6a84589497dcdd53ef4e9c475276bdea418407fc7293. 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/TR0440601701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942fc73ea45151de3f16dd71ad749d4b4db099358a5569028ef47fdfd6d4caf6. 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/TR0440601702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e557a9143004ae50f7846fd7106d9213391cde0cac6503896171f3d40ee313. 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/TR0440601703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed943042542ccbb0a5215d667d3cc2448c49fad7907b86fb56656da34652ac25. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/TR0440601704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a2b05810c244347ea28f8283f6b5a1bab27ecaef6ffc218480b57edea16bba. 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/TR0440601705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd859a3ef41875e0a5a0b97beeddbd2eda17e1ffa656b3ab25be8849cfd0d2d5. 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/TR0440601706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ab34ee09fd04d3773733fabff685f3423029790a4e9edde6fc24d49e8640df. 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/TR0440601707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b988b2ca9d047d83aee315a83ee522588015b6b3ef62614839f68fe7dc9d6e9. 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/TR0440601708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe2dc024c05fb2ce212611a87fde4a9e69073d64e774f281393cb8b24c9b4137. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TR0440601709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x101264a26caa3c02e4d676286525bb3ee843b5770f7c7a6064ab437755af9b20. 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/TR0440601710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34f99ec1c76c056c135af416da817e8ba09105cff39d6ea704a157798d64e8e. 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/QM6P41878995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07c875cd08af87d7e62d20252638ee2fab4a9669860a2cb97cd4826f13a078e. 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/QM6P41878994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68846e7105de705239b4bd1479385930cd7fcb89c93e50dd457d2a7b1a299cc. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QM6P41878993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad38d679916746a2a275ea7d69d9dc8b4a4c2f014928da5992c9d7b6d9b7664. 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/QM6P41878996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea2d5ef44b90c9160703d1f12de563468e2be20218e73337398c0605722af19. 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/TR6160800122.