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 0xaba83455efecc12f72008a884222927c640468c5d6385449d68d1d98c94b97d7. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/abad2541-03e6-4f04-b7c1-00c60182356d.json and https://artists.proofprofile.net/proofs/artist/abad2541-03e6-4f04-b7c1-00c60182356d.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 0xb9a80293be45de71bf3a18d7b9fcefdb9c770e94261298dd303f34d732a6d190. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QMGR32253680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5cf998772204c12a9c1be0bc243581fbe49c313b2791bae1668498d1b7b6c78. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZQAY2199458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5403cebc317b2d9391222e61dfefe9257aaa39c47c9cd7a8e70843698e479ab. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZQAY2186264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a77814ef4b29dd9529140e452f77138421b12c4c116f171d716ba29766713d. 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/QZQAY2539111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4563244741832b0fa4e514cb2bfcdcad84e5074dfd0437c38a8296724a6d9d55. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SE6SA2168396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8534dc8bdfa5e48d0cf89d40576487fefea1b5f12e64363bc902deee4b53c0. 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/SE6A92146435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf43dc7f9e258d654da85b5b78bad5f83d3b9ee241f46ae4615bb1b21e8b0417. 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/SE6SA2168397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792d3ae2432df37dd7fefba52944de6798574faada81fb8818da39b887225291. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/SE6TI2021530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae918791b3a0f78bea2936be8c6aa963e8f5ff0aa75e03fac9f6f3e98224c1d7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6SA2168398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a25dc26a32994d06fb9ea934e1a026781a90e3534f280aa63e79ae5502bac49. 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/SE6SA2168399.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92111839b82d234600b75e9e30478881000df43d1b09afd0e5b0e693ce83b75. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SE6SA2168400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec4828abb53873e71b53d5cc019cc7a83cd2663a1dfaf3a9efd126a6d43d7dd. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/SE6SA2168401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5506901ff933419d43b4b00777a9df897d6fc702ca0d5b9c38c2fe0d3c337ad8. 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/SE6SA2168403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc978368ae70c54026d7f989199219da7e5e345e9db6b4648a19dbe7754aa87. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SE6SA2168404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcf0deee0f4a7eaf1d6966f9f6d076f4277a4ca573ac83eeb2b233e6998f572. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6J2579692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b57f0c4e8819e250057065cc5729513ee8ec6f05d90bbb2d9f91e83ae26a87. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZK6J2579693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9082af7d023ff394f12fbc419c3b0b12242de1b91c4c99be7f8d8b0b8f30c742. 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/QZES72540641.