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 0xd58de9086aede1df6e74b9a54870c05e7e4216b5b1fbe50d3110b06fba0ccf42. 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/090203fe-35cc-4a61-b724-1ae00582f5cb.json and https://artists.proofprofile.net/proofs/artist/090203fe-35cc-4a61-b724-1ae00582f5cb.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 0xc15ddef6f1d5d6a4df3c6bf09b19e6cf76e488a763c851e6a614b91427d0e1d9. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZES72079195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87feeea6942150ed3e780418295c78551d43ee7b29069ec3c8c99a026c36621. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZES72079201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff82e422ebe20a1d39118711c3fe1527c6d89b1d3c3fd30c62fa94b2350ac63. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QZES72050700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x910165efb3cbad5a4326d2f10a48389bf18f7310b8376a7fc7445cf80efc66fa. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/QZES72050701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af4e86e206b80c306fa22606d1342a75690773ade4f408773eaff1d7787794c. Chain 2 (Bitcoin): anchored in block 959088 (2026-07-22T02:14:33Z), 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/GBSMU2375414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dd4250a9046fb3e7cd644fb2c81326390d7266f72fb371ddc8492d51213e2a. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/GBSMU2375615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b25d76b6729807d9081646c19c0bc307bfab28ee2232e3ed51cf87fc2b1ae8. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/TRAKF1610384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e31393056177c65473b2a77136ba1ee2898007f84bb5ba316b35296eca6556. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/QZES72034870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34fa2ce829b2846d0b50a907bbe3497ec470e35419da7b3918009256e981d19f. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZES72037752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393fe38d9c414c7d6e1bcc9713d7a8824d383a7f30011a9cee5001619a4a5f48. 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/QZES72095412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f0c366907a3dffdc6a278e92a986dbb04db98c3088b5c2b1b473cf4c4c41832. 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/QZES72096043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dffcbac63f50c53115da101e7c12bc11910366d12ffcca397b1eef2ded3eda. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZES72054091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55283cc0b2677eb40d055850eb0fc156a173acb9155d74af60a9fe8baeef913d. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZFZ62175943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb02b81ca93d668b941416181b006f1141e6ab1ca96786bfc6d40bce94986fa0. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QZHN72136443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aab1f29528a9106e24edc2a28d3c80a71d7fe5b75dc1f6cf3482bad9177f24e. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZFZ72308806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x966bec3c9994c4c7108477a37583cb1eec44c328c24bd098f56b7a205a337f53. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZWFN2313703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53b28fd2289b960755a22a574e7810dbff868cdedf5baf1babb647be40d9bb1. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/FR96X2473817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc13bfa385f1fc75c7411457b9a485fbb7789fd5a91931f8399c6db2f787e548. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FRX282478711.