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 0x86a345f10b5498c8c5fad685dd05571017f97286adbdbcad7faada4d0581a817. 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/a9ca57cb-2615-4684-9f7e-0d1c38c938cd.json and https://artists.proofprofile.net/proofs/artist/a9ca57cb-2615-4684-9f7e-0d1c38c938cd.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 0x7a85382358ea2e599d21483c2d6bc8a92fb8076253486c6d90a0c475b871412a. 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/QZNWY2069782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d4aff0fcab8aeed2c4b569246c135ece077b6fb62d5e6f3d57a0f06d36df0f. 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/QM7282494860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcac90063ad32ef689bd50e152ef6d014dd4cf0e5879a90b9089d27a12d2b0f54. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QM7282494862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a5328b45644dd4783ba48c1586d12f3b380c563461f3b6698a9609a2f6782f. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QM7282494864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ffae91990bf8c8fc1ef71a01d3892775d15807cd4bee8e02bd811216c77d18d. 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/QM7282494879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4e2163c030ac5596627ab0d4126176bcf9744407b99c311a62c09b7b631677e. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QZNJW2499123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf988c6f24ba02cd5ed9cecf4c9d9f4bfdaddb65c5745246377f3944a2713bb. 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/QZNJV2424393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x964ca98c990e4f8dfa4f3463db1fafb9f7569d5483b6251684b8362d8aff06ee. 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/QM7282494888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145aec317acc10748051662f27c306a69cd9c120787e9429b456a4a2d194bd87. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QM7282494891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc43276b6ed807ce8225f11532598d31122ac257ee0b7daa2e55faac3be874648. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QM7282494896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x092618697a9fa147ea43746bc781b68ed6a12583da3d19ce9003cc8813fdb9fd. 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/QM7282494897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161dcbd90cecdc47a45e112dc10611b27cb3708b2c8a5c54b3f6dc1fba659e25. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QM7282494902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74fe22a9a482abbd7a52e38a9c9f319b99c1f996932f7c2a22d47b66e526b3f6. 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/QM7282494906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a8e22c7aae99926bf40c21cd98ea742961721ed1abb5903aca52e6ed8fb1a33. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QM7282494907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec078cfb0acffb44d21f6a199fd3c69c05c8292d1d5b5b1d9b59092ed582cc2. 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/QM7282494911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914fbdb6173918eb293bd3f24d5af29451f3171b2a1547b62d257cbb99a6a450. 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/QM4TX2529417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17b374c183e59509d1259691eb40c483962eece0e4fca17d3f703ce3a342804f. 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/QMFMF2330568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265ffa9d774bdd5efecf2827cf417a9f303334e3cf330938045639a2d2708be3. 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/QMFMF2330565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9f64ea015744fe751535bbe49274dcb9da3cdf615e67a97c5ef774d3a8cd563. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QMFMF2330572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb5593c0f6d0628a456fef851f7fcb2427f4b9e769fa51d9907a546f198dc09. 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/QMFMF2330569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6196185340d006cb79f1e8649d2ff7f5f9f1810f55ee1af5f5903cbf73c199b. 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/QMFMF2330570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4dcb32b7e41247330374aecb6b147ad0ec53208fdd2553d8a572f47c64d10b1. 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/QMFME2326393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2832b4097b8dcdfa754df586b175a0c1f1cfbb81abbc57cf4c62f16c6e248d00. 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/QZTB62209918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf06953d742bf15feb7f8ec4c0e4bffcd3498695741a0018af6d3df9ce6cf89b. 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/QZTB62209920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896d72cacac8b7c2776edf5f77af5bc13e0b6b70460b11445ec05a0512e196a9. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZGLS2451997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84f3d13135094c5cc3633a4d4a5d2ef60acfd2ee23495f8f7b7fd51a3a067ca. 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/US7VG2480468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0449ffa8235048a74e38779cf8318c2b930ca291566cd1df628ce3ba3c26a3f2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QMDA72332060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37d33794351675358303bbecaea1148bfed1f1013794f79a2279cae5d9e63a5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QMDA72357650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cca05b83a051c64a13708c293bb7268f7c372eb31f6cf10266fd2de5b1eafe0. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/US7VG2339247.