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 0x973dc5c28b28bed7b4c2a7f8f19bb025f078c4dad4fd672fec41f4afa864b26b. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dff6ba76-72b6-4826-9801-f06faba4b30b.json and https://artists.proofprofile.net/proofs/artist/dff6ba76-72b6-4826-9801-f06faba4b30b.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 0xba511f65db743a36a08be453cc3309cb8a5f81abc2a272bb13c5e2c94bac6763. 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/FRX762276267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072f061add9f8569c9f42ce3617b7c6f7f47b7af4acbb0e9c3b959cd62ff00a5. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/CNF121901408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a169af447195fe650bc1ee521e4c1acdf7d3c3a383af12a0f6eba99ed198d6. 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/CNF121901404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45504a4a770934f65f6ffe9a358713685b13f67af84c3b4a0497d950755d3f8f. 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/HKG731790760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ba67378be4778a765837e51dfbe13314615fe6653a5641a162a32267573c15. 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/HKG731790771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda1cfd4cb56f2309ca5605856abcbf42e395ff603b933f8a104517b5b46c7e93. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/HKG731792744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc582f43a25577bc7b4fc54c26a017d4ae9a27e26aad9b6b2792391fa0a5694. 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/HKG731792745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a11d5ea0cd2d48cd1ce2ab50162fa4116e80a8235d7c28cbe3f258526e21f1. 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/HKG731792746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7d025f8ee328b4c9971f6ff8987b8283bb4ef69b6665f0d7539c08038ea0c2. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/HKG731790811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb86a852b1635e7ed82ba0e18462b81e4b45adec6854a6a0ff4756fc828c71b23. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/HKG731790812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21458f82334d182cf3fc8fcf629cba3177201b6b915ae821822b32989fcc6808. 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/HKG731790813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b940f4f08e4914685a45d1f3ca649dc94470142cdb09c3c1d80cc7da2503d41. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/HKG731790814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a540c7d71f4970d52d04562b4f252f599406e22c71b867238d9449f5cbf6d37. 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/HKG732364832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fdb6e27f7eeed08a2083557d8306330c8901e2b80c953c0beda179ad5ed4ed. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/HKG732364834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa82cc43cabafe1dfabd0621bd80be41367e8250ab3e29109c666c74537b78f61. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/HKG732364838.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ee19c4fdf2ee4017b3b31a9e9fa52f9f94d4632c69741d38282d83ff339b5e. 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/DGA082392695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa386b9109f64a5a40dca6aa08ec9e1c240364958120209019d6872495cfaa380. 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/FR10S2265700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eaa31b0e9b8de1443a44aa0175275651650556a03f91e9b9af316737c3dbcad. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/FR10S2265709.