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 0xb42a8e8e2378fe1a375bde349807194f04a1f0e7a03d16ca1f5574d23fd1a7fd. 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/956dd33f-c904-4e2f-b40d-2a9d5bca21e0.json and https://artists.proofprofile.net/proofs/artist/956dd33f-c904-4e2f-b40d-2a9d5bca21e0.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 0x2706113d1d5758d846486e34761e6c56e7ec425f4d6d279c9fcb2ff0d266184a. 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/TCADP1824084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d9a10e8e575ad677a18f9fe903909c84034e9fc6f8f64374d73b43d315b539. 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/TCADP1824094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd21d2e6456f8bc5dfaee3e9e695f0faa2c51c6f3af35e94086690c3ee6e8308. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/NL1XU1900068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73be787d2e590f0cae93ab086265908126ffdc681eeea6ce54ff870e8bbbfe49. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T19:04:10Z), 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/NLUM72000124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfeea4ee758734a0a8192bca265b5fc7bc2b33dc8c005c7436dabda2cb22ccf9. 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/NLG662000097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3909a6f4c813dfe9fb6dec4cea209d3fa20542144c854474a80f5d6f6fc2ac1. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:33:19Z), 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/NLG662000027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee280022a752bd0650fc953d869fe49433a8fe696d348d03c0c211bbd782919. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NLG662000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fde509f3d94357ba4ab92998c4160f0642bb32add87927c8beb5f89273d9ee. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/NLG661900286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c14e33ee326da8eeddfbad6f7056bf2a64ce5b2a7aee8b256015e797313596b. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCAIF2439508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41895aad29fe6a79fe951a2f0240bcfda6dbed0ccfdc90ba67a55171da74a02. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/TCAIE2439616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa4e3a92b5e9b6d3dfa20cd60ad64a5d75b03c462770ecd8f5a42ef7e593c15. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T08:07:27Z), 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/TCAIE2439736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a779561a7d09d0db4fc30f935860962ba06bbfbac899bfe8acfd2a2632262e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCAIE2439807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12443e0d3ddfb7db86620b29e624d91f2eca0651bbc598956c9ac6a35731c3a6. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCAIE2439998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bca9508af90273d2442ea2e8481492669357b95f8cf9e10fbc5b0fc6888be58. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAJI2588275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7472bec75f332b45451e31ebdf1c71572b3c7b1cf0af4055fa5875c49faf554. 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/NLZ7B1900021.