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 0x4e32d24b9f4716950d57393640d1b2426500e2e58f36d92cce0d818e40488e91. 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/d72b0b9d-6d94-457f-8c1c-53e0954a923d.json and https://artists.proofprofile.net/proofs/artist/d72b0b9d-6d94-457f-8c1c-53e0954a923d.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 0x9ab9ad6d4dde9bfcf4d9486914b929a0c99fac1edaf7f54d135e0a5b75a450a0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZDA42289544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacfbad463edf3145709d1a0878ec5148e8f3cd554dbba3afe3c8c209f3530002. 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/QZTB72464659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5551b65bbc903539865889c8bc21df19c3042651158b1903b20dccef2ad3df8b. 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/QZTBA2460629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a914ce74be8ae3e6a76ee32a9c68feb37dc15a8bcd03c8246546137a85c3ceb. 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/QZHN52419203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d92a1d1abb6e1b4bf3ae8f988eeae32b0939bfbd74f5a903dbaa2c67f116ecb. 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/QZNWX2368657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf555da4aa07d9d3ca800fd3e195607c0b70d0fe167ea1615068befd8af16ac. 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/QZTB62350179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe63c81437f50efabb609bc36baefdef15afc4ebe49f16a39abac3568f5839111. 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/QZPLS2311403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fb756ef4fd2c28dfa77ccd157464fe6516b904524a75d74c6718f83c57ef85. 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/QZHN42393901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e081097e8dbdfda8ebf4bcbe3b82302b0f12fa050a6dba0e124b8cae7e7d51a. 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/QZFYX2363422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1efbf9c6bff62310afdd3208ab2a5e48aea665f22969568d878801fd0ab9a7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZRP42228361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef8ea615bf16a199fcf5141ff3bfa6c3f4b31438754124a0d6b4ce39864a88ba. 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/QZNWR2210344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6d91705a70027c700ddc086d1d40e94a973ffc12a5f717716daefa280cff948. 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/QZES92270197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955b878f5a89e0ff76b09193fdfdafb380a7a51be4a211698a75b3c96a27961c. 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/QZFZ62253775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee5cb12928b9255b287e62d6ad0a49725570be3b6ba922f1efd86a24f96e0d5. 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/QZFZ32201714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e05aa786cacffd27680cfccbdc3ad5e0b01197b4e25110e346058c55d6d0afa. 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/QZK6P1988195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29d4854e15b0bdbef6c288f6ddcd0ee32c9cad649cd98fbe0bb674565ded38c. 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/QZFYW2043063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf575de247a39a7e9c2e9dad4420c12f09d8adc4b387f224b2e79d0f2b1bc47c7. 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/QZFZ61992956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36bf81022a4635309e476631ae344dc27d573819da7e41c6321f9279d694b28c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZFZ61999605.