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 0x132027ed027225311d04e9b3ccad91845ab1283be17372d03798696423d4443b. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/251c0dba-9bb2-4d08-b756-9a53fd92d704.json and https://artists.proofprofile.net/proofs/artist/251c0dba-9bb2-4d08-b756-9a53fd92d704.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 0x69cb9b6d74bd14ed5d87014a6e746a9b4e7b58ed24833262634b1fce8f16890a. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CBEYJ2446190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0f52391e962c00d7c190ee30bc0a6fc79a02368cb11db130e7f3ceebff2a8d. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CBEYJ2446187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685a15df401e4a377912cd1d78320d70056de2684cdd319f07cdddcf87735dd2. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/CBEYJ2446186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0754e05e5696117e8ab75a4145746f6d1d919e91e6ead0158778b28f4e2446be. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CBEYJ2446185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8038ecc00971f7152a613e1286358b8b188a44f7c1cae45c8ecacaf53e13fa34. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CBEYJ2446189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f11834f4e48a226996d89bfff3282712dfa26cb1f6c298d2edf8891cb503f26. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/CACWV2579382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb214700a6f5b9faf2599d7223b316860745b7096c46fd3fbb8ada8f40f612c8. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/CACWV2579379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bdfe9c54f80b2235515f6b0aa5bf90aae6757dec1ee5f06288ca64c6487b0ab. 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/CACWV2579380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1362c07530053a9d48ca6a96e6f027e1f0c5aa121e07a339f216dedf4f1f5fdd. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/CACWV2579383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f2cd7f3d068359c211a1f2d0f4910872a9cc0c1cf9d018d97bf9d9938088c6. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), 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/CACWV2579381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e61a10d56a85c970fdc14fbf6025ac0b8a05f451760dd2eb1f8020e92882387. 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/CAENV2535254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1511aec53b24c94812f5acb03a9a9ca59a713abcbf4b81e6beba0872acf6dcb6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAENV2535256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5321895cb34e9f298f946b8f1910b039c73fbef66c64516b9a5b049584449335. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/CAENV2535252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04d007aea19c5f5ab759066913e215b2c9fe86e13684ce1cfd50517cfb112a8. Chain 2 (Bitcoin): anchored in block 958971 (2026-07-21T05:04:56Z), 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/CAENV2535255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x283cd005c1288b756e5cca17a61d55bcca59613372f3297feb26e87d9f57dcb7. 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/CAENV2535253.