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 0x2ca232ee6c255882b58c7d3bed22c4e200704cd12ac6eb29c74176767bab4ea8. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/511fbb5b-e09b-4beb-bc7b-e159bc44ebd3.json and https://artists.proofprofile.net/proofs/artist/511fbb5b-e09b-4beb-bc7b-e159bc44ebd3.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 0x2da9c26835527818ad6f21c7b2670f9f6000a555406a1fa8a0ed446080c3e080. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/PENMS2301946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a28c75caff7d2a732b7a7f855095a76e3175113cb12b5488f664c3a9906569. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/PENMS2301947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c9410c86caff441d3b602a2051c8d96edc7a902d568cedd0f731c5d6e603492. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/PENMS2301948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541ca0960b18a3d0902f1a79170e3ce1cba3b63a0f72a86d825bdd65c18b45b7. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/PENMS2301949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c71293ce2d64d2a369c5590d3a5f759eb62479b74d52c8bc9a3ca4be2d73393. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/PENMS2301950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1bfd4bbb05455fd9c7aa8b1a7660b2dfd23b8630d55f0d9961989319e269b3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/PENMS2301951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6dee08b17c8aaa1238df1bcffaca4921bb39897f8839ec7f9f4f293c36fc3ad. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/PENMS2301952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f48923744e217c2d775785b9c39c34e9cde9c3ad5ebacb9b7ee0cb43e32ff2. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/PENMS2301953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c6aec30dbd31b84fc9d99b96182679cb37f7d16ac7f1a301c4a369e69762f5. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/PENMS2301954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16b384f226e4ed31881782975e0c4a5e5077a8d3d622283725209ee7d8907d7. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/PENMS2301955.