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 0x5c0a3a08b62d3762e84bf9e393bc9bba656ade4396f7153d562a941448c9b554. 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/99cd357a-bb9b-4be2-942d-a1b2e8525926.json and https://artists.proofprofile.net/proofs/artist/99cd357a-bb9b-4be2-942d-a1b2e8525926.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 0x50ebca6240f13df88cf3c0f3fdb860b1317ed7943498682225e93d319009ac6a. 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/ZAA012100210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425d02105cbf8b7ddddac469cee758498cae695d6defe31b906b07184428e7de. 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/ZAA012300295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbe0531eddb2c18d1edf00db79363178daf3be778b0f94c91dbfa2fd195509ee. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ZAA012300288.
Tsetse (feat. Nobantu Vilakazi & Kay Invictus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf736aea79d46b5f9722ae8cde10c5ef4ba81f02f46f6774a5aa220828edfc114. 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/ZAA012300240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7238bce3ebdb6eb8fca90da72077ddaaa823a6547f80db4775d5ab2b0d2b7f2b. 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/US23A1527014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf48969bb3a7e735a1a63a444df472ad7c92ec3d47fef8da6ca7e61a14ba657ad. 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/ZAA012200265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d06181beac81f91accabf145dab28872f25c859744a0faaa547f4faa20f4250. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/ZAA012200467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db5c3d0752f370b1164657b8f0df262e399af591ac2f017a9944558071bb9e4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZAA012200468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2317a09a9026bdd435c19a2a26ba4f7809fce6a906c0360257ff342124bb8b3c. 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/ZAA012200469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc480abb9331515438ff91e50a7bc4598dac9c0f60951f91e6e94be6c624d2f. 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/ZAA012200470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd604912919a56d877727607e53cf63d0fc911aa84b36806275d47cff3f667b8d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZAA012100202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5277b8e2fea9aa1188d77ff272507b502a24007f5a6fe486d2c2709c4eb98adc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ZAA012100215.
Mbali (feat. Lwamii, 2Kultured & Kay Invictus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f11e8349413d5db00b537f625e6e44dc1f837887aaa6a51b916ffbb875b4b0. 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/ZAA012300157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603ceba195b86b8f9150d9021fb6d61fffd6f944a257cdb171202fcbd2ce3f14. 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/ZAA012400213.