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 0xd09fffede940f00893c6addad47170154e67238592cc7a5fef90c26bfa3641e4. 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/ad10a9f2-9516-4e08-b602-69cfe2cc5647.json and https://artists.proofprofile.net/proofs/artist/ad10a9f2-9516-4e08-b602-69cfe2cc5647.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 0xc134e382328f8e25f3a9a3701fe9ff84da129e6b76c6f8ee4bf11f2adff9b1e2. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZNWZ2007340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27eb238a03bff79c011632ae5120d753450cc65bc5a9661b0a95ff797b00729a. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/DEZC62138223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82cc80be56e29324a3f29030edf493235ba6a39506368d0c36355ebe912ccde8. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/DEZC62260419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce84580648fcf5358ccaa9b02e3cd75869f02921529ffa52d774e9538c4e1bb7. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/DEZC62260422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947226759662ab4145a659dab7c0184b77577c2d0df630cf4009e6fcdb87e02f. 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/DE1CZ2200176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf45f177360f4a003d901e0d5bc1a233124225d5da6c2b1396dc6b4dd62f9fe3d. 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/DE1CZ2200135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a7c63b33c66eac4bf61b04a9da1d3a66b4f64fd5539e3f79a36788a350830c. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DE1CZ2200137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc565513decd32dd0fb847c9ba5f107ae24864c765352b796b514bf7d91054b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DE1CZ2200136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd1fa3b75ddfb3ac8608cf416bc2ccce6fe484c3fe344cfa6ac0a94fc9b2e07. 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/DE1CZ2200139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e28cfd47030017f86e8fe293e429677b0662b07f13fa78959e41ea061587b9. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DE1CZ2200138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e2cda7afd7c222e8e12f7ffda0c3613d425c3d3d1441a7300fe8a71e0d72a6. 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/DEZC62327985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644d280a13638a95f240cf4c83a10a681bc8d803e38e4496a593739b62802b55. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/DEZC62377507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81e386fc9bde973b260153d999d83b0c137b64e251b4fd661b141664b2c7963d. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM6P42424010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77e1a7a2f7cd4a64737cbe671e97ecd296afed03e6decdf3a090f62ae7b81e2. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T16:46:31Z), 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/QM7282455968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3953cea0f7a42ef7869438e753abacc26b613a33f93b6b0daac89dbad987cfc8. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QM7282455969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb8a90d233d59635b3b0ebb20bf407ed91bd277cd02b3f904e5186819f1ec36. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QM7282455974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba97d435cdac47e5411a887e252343417b146e8b36132f6c9b49699d6b96593. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QM7282455975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fa06deb708ef1ec50f388e0df242b6a411213954a2df97c148bea890a89554. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/DEZC62592431.