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 0x52a44d59a35cf60dff8b2477016f29dac7f44a4c84e2944bdc56dbe96e7fd6d0. 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/c8e61b1d-3fa0-4667-a9fd-efee28067fc5.json and https://artists.proofprofile.net/proofs/artist/c8e61b1d-3fa0-4667-a9fd-efee28067fc5.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 0x088f790ba89a7d04c8eb889447d7064301301f78e05e52ae6e181057b0281a01. 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/FR2X41707983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ce7f29ca6df8a044bd26de5d53900dd3a15881b9f45d7573f6811f77fafff6d. 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/FR2X41707992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x707903533f6081e84d3aba5436b982669541e8d69a92f3587ac0e457bb9080bf. 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/FR2X41707982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27ba0b411da3b2b144e4a229f2c3ef3580e11fab8a6f165837ff7d9c14f904d. 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/FR2X41707998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c6c704e4e5c7eb701447111d6e2bfdf67a7c4b782ec0d4f2ec19c0f33f4eb7. 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/FR2X41707984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc41135124fc6c9d2c7b846f17b789802bf3f127d976dd6c10ed7ba9d417eb435. 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/FR2X41707993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77cbd316f51aa0afb44e145b63090f7d8800861abb9f7e70bc7e7e1a3571f4df. 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/FR2X41707991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a9d2ef191a1908aa469dc70ac7468623bb0d7d9c05b219d2af69bb3b1a0123. 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/FR2X41707986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0788bc917ee7192ef0b466c0f3ea2e45d9046380ebec683c7accd13f7b9207f. 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/FR2X41707987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5ca349a3114f9a67be4aa22d55842a994e1e5477ed50b698d9a50f49b8814a. 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/FR2X41707988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x846dfba6a325308cade88dd14b9b7be55be4649ea01b2f4cd1404be3994b7fc6. 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/FR2X41707989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ecc3595cba84059e0f8375cf9f3cd034599cc5bfe6d303d6a8e7b9981b3b6a. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/FR2X41707994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f7d5db9bf85fdd86a9b4b5846ee68d992eaa759de6120f847f960a4bf8a999. 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/FR2X41707997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277d6f402bad1caad482cdb837c2db2e5aa1324272f728984bb2577bf597e8b2. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/FR2X41708000.