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 0xe9cea7f1aca32d71551872922fe08c72d5a50156f9200ffcfbf97d0ca4978469. 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/f071943b-7cd2-43e9-88e0-ded597be8c10.json and https://artists.proofprofile.net/proofs/artist/f071943b-7cd2-43e9-88e0-ded597be8c10.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 0xc9b12003cc9165f67f076de5b592e94cb59cd6edf50af6cc22409f4a9d2ea4e8. 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/QMKSC2101727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71170338872c12a3670761d63cb078a727dd2b92fd5f43c28eb1b03e1bca1e18. 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/QMKSC2101728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b57519fe78fe1bdd1974ab198a3f003edae110dded78460a3095bfe5cd1acb6. 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/QMKSC2101729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d75e4a5c794327aa1b3aed5ce759ad5f32d89adca3d60507758c404be822c8d. 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/QMKSC2101730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33ed62504491768a0125b96aa655cb553deacde30fc34b387938587fb62ad8d. 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/QMKSC2101726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d8a9c5c143c7554106ebd21444678ef3f3444d2b3c3ce9cfb4b75465aaa1bc. 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/QMKSC2101731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d86bda614fed769dd3fd5cdf4750e75261348468430c64d29f092b31244b39d. 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/QMKSC2101732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f5c5dfafc2fd4f4266006ad50ee24db41b517ca41097a64fc866a8e19984a12. 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/QMKSC2101733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78e30a82bddf577efd8b633737d6479a976ef07e3b467964eb0c52d8239a63a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QMKSC2101734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f506387d92ba7118980b22d23ecd6b8ff5f973fe839a1625d03e536e4f809bd. 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/QMKSC2101735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33ed62504491768a0125b96aa655cb553deacde30fc34b387938587fb62ad8d. 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/QMKSC2101726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e275dfd43fcfc77cc62799f40e733526ce220222cdcf85bee22b2e02daabd13. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMKSC1901492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf761fe67914dd02eb319e22d160454a92d38fbe1160e0d9e6cc6a6c1c875bf9. 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/USLD91735246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf761fe67914dd02eb319e22d160454a92d38fbe1160e0d9e6cc6a6c1c875bf9. 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/USLD91735246.