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 0xe34195f9040fed84489af4c661a9907171dd191f23465f3cffdeb534bc9fc402. 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/0ca45b4f-46da-4193-81f7-eb6c7ad15be3.json and https://artists.proofprofile.net/proofs/artist/0ca45b4f-46da-4193-81f7-eb6c7ad15be3.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 0x9cbcaf5a93d9195d7ade3a95d685364c6cc40ccedfdd937af18b2e32bf9a7234. 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/DEH742310495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73299e100788bd6c7abf8f40a0107ae42eb1b8fb186432de67af72881b67967. 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/DEH742421470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec0778beb4795ba5af259f6c9530da280478420e76b677653b170f5d4c8cfd41. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEH742415289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2c551082d7b60b56bf06afbf7719b61a7a0068ed39f9232d760673c38eca57. 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/DEH742322086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac70ee945a8302974bbf96afb1ef1619fe7edf2b1b5cb26b0d253b03975891a. 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/DEH742408017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fa0035c9a30b3de0c030bbb989ef0749d80ca2475f60a348107a0edaea4d09. 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/DEH742408018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6fa0035c9a30b3de0c030bbb989ef0749d80ca2475f60a348107a0edaea4d09. 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/DEH742408018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac70ee945a8302974bbf96afb1ef1619fe7edf2b1b5cb26b0d253b03975891a. 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/DEH742408017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c44cb4a280a7480faf8ec8f843264f59f68a8bd0c56887af0fdbf619d3e2ee. 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/DEH742402812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ef74845eae3326707a25e610a1064015d2d932117eef3b8c121e0612c6b9d9. 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/DEH742402811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cbcaf5a93d9195d7ade3a95d685364c6cc40ccedfdd937af18b2e32bf9a7234. 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/DEH742310495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c44cb4a280a7480faf8ec8f843264f59f68a8bd0c56887af0fdbf619d3e2ee. 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/DEH742402812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ef74845eae3326707a25e610a1064015d2d932117eef3b8c121e0612c6b9d9. 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/DEH742402811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2c551082d7b60b56bf06afbf7719b61a7a0068ed39f9232d760673c38eca57. 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/DEH742322086.