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 0x1530a221291b472e92e7725b01f8bebc3b75100fdaeaa88dcf3181fe62cd99ff. 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/adbaa7f1-afaa-4e92-ba13-e190f80adef0.json and https://artists.proofprofile.net/proofs/artist/adbaa7f1-afaa-4e92-ba13-e190f80adef0.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 0x4079e844ccd90102e33da58918f815ef69e701bb0b1b5d62f57e538cd08ebd17. 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/ZA56E2305128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x740ada9870b57e346688f8ffa05fdb580a439202427a1538d253cba769f6fe67. 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/NLRD52354255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x703a3cbf33681166fea84c9d2b8c7e109790feced9da6102f31ce09b81183405. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/NLRD52424598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11afbd27b41e69061adc9c5e5770d16e4509cfce0f24dc34b23739ddf16c1b83. 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/QM6N22377724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158ee2e9bf48eb99ad1819cb6a3c906d9e0db3758524dc6a1f2c70dc5aef4f3d. 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/NLRD52354234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11afbd27b41e69061adc9c5e5770d16e4509cfce0f24dc34b23739ddf16c1b83. 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/QM6N22377724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158ee2e9bf48eb99ad1819cb6a3c906d9e0db3758524dc6a1f2c70dc5aef4f3d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLRD52354234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ef6d4f02eac1ac37f2b24e0aa77b91eefd93cb45b5e32a20bab74a1aab92c89. 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/QZTVM2247984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8fe67e5b8cad57acbfd9a352463edda9c02e5a0257abb35fce482a67abeb8f0. 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/QZNJV2174969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5691d85d1277d0cefa843ab4d72d10d13f8c27db5c8c6823905567060122687. 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/QZTVM2247985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b80de33d8a350aa59d50bd58f31d3d2286e5239a7f8703e6848d939527ec045. 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/QZTPX2287180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc668a07709ae74b6efa5e0929a65901abc72f7dbaee3eb48ec15c849fa6204. 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/QZGLS2228004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23541c159e237339c7d9b25bc85a1b937b99efa38acb5d00584361b8b8afdd6e. 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/QZTVM2247987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x659c39b2a090151de1eddf4ed04ec8edc1fbaa6e44458c12db09352aaba89d16. 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/QZTVM2247988.