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 0x0ecd77704909a81c5f3d3e94c4596fef7a7330b5ef16e7ad22df9bb1e3e0c765. 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/4a5639ee-66a5-45ff-b61c-db1ea41055e6.json and https://artists.proofprofile.net/proofs/artist/4a5639ee-66a5-45ff-b61c-db1ea41055e6.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 0xdce4cca439e2a1c431bb87d59a8d793eb1fad4d78d2988e7a975e66302aa2ff0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ZAC012201235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ecaf07eee668d51729fba52bff4614438c7b6a21c1d5bca04ec0a5fbea7af5. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ZAHTI2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32a6345d00d0d11aa69b074b7faf83797eb8f1f0ddf902cc86cdd242ddda5865. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ZAHTI2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0f94032e9b14a56f245e85497eb870b5b2696b1d1f1837a363b5fe64efc77d. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/ZAHTI2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67490dd396c97c1c06c104b902b4708d647e9cfdf570db8d633706f799aba486. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/ZAHTI2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98da26dab5f40dc367bc99047efced679611f48062e80eff260afd1bd2fece28. 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/ZAC012400863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ccd26bdc3cde5eeb3b16a169612682eccf717510cf6ab694233c6651b2c129. 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/ZB2312300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ccd26bdc3cde5eeb3b16a169612682eccf717510cf6ab694233c6651b2c129. 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/ZB2312300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a3ed6ec9c9ba742bae6e4c030c927df8d25ebe0157f497d25a1990471c857ee. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ZB2312300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104de25c8d1ba061a643e5b0612dbca2628b53d71e4562f8c86f7c3e5c805b28. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/ZB2312300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920b4ab04d445edfe75242081072fc7d43dc911cbd3d5f8b955d8d7311a6dfe6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ZB2312300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00a9f3dc7152e0076c03155d4312a57115833330375d6d56fc7da6b7cc631b26. 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/QM4TX2419280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203d35ae924af134d44022cd5716394443289d2fb54d513f4daee0b294430dcb. 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/ZAV012200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54778e470f14f734d7b13c63b535f49ba697244ff31b443fcd6d3ea691602626. 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/ZAC012201370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cff46b9e1643f2dcfde48e193fdc111f91ebb7299a7585de1910cc70fd519d. 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/ZAC012201373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1aeba9d607ff6372c4018667c5f2cfb537c18c2037051242a13464389bd742. 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/ZAC012201233.