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 0x2fa7f5800eba78c876642948f523bf24f5a2b4aa77aaacd2c423c5c15315ecf6. 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/d9a02877-a599-443d-bd56-af4f9cc392d0.json and https://artists.proofprofile.net/proofs/artist/d9a02877-a599-443d-bd56-af4f9cc392d0.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 0x4af7b3bc87f1256730d963d114d01f04cd3ae02bf163f5b019de475278e84bc4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/USJ3V2179358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08dc55b18e4ed13123615a27edd95e897c29c810590d50e58ca3f22149becc87. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/USJ3V2179359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23ca94fd927f9399a8434fe0d810d03c27307ffcd83917a9414c35d498cd1f0. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2179360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6059c3701cc3b5ad16bb4a30daaf6c34554b7ce05e74555b158a614a5ff8107. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/USJ3V2179361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8dbee6f6df455d86092ec4786e512e19dec7be9fca067b9bd05398215690389. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USJ3V2179362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a90d4b5ec2c28cf37e6b35144e5b8d2b20e7474b88c96ba290d76681383756. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USJ3V2307702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc26f62dc4616be075636bcec2549d55ab77bc9e68bdfd01a5acf677589b7ef71. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USJ3V2307703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48595919084c6c44a6720343b5c9ec62fa06c652fca0c14d4e2bcc539c94fd9d. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2307704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dae53446b38ead85987cf251b1ec6eb3baf2d3519c9799dd076bf3c81bff8ee. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2307705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe56b6bccd6067f90038db9bf05b56ac83c00d9fabcfd8aa0e110836fbfd70d1. Chain 2 (Bitcoin): anchored in block 958351 (2026-07-17T02:38:05Z), 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/USJ3V2307706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff6d4c8bac9a1e1aa429daab65fe4f2a1312f271159c07c263d644fcae9963e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V2307707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b53ee307ad0bbdf59485c0192c7b3a96f2374c546cebcffb098028efb1fd5a. 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/USJ3V2307708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116fd2229ec747e9d94ac5412aeea2d6c71bf8cf2d80f6385ff201ba252b6361. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T02:31:22Z), 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/USJ3V2307709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc0dd6316e1bf00ed19a360800b6b69f745563e064059ed0c58d01a57fea8a31. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/USJ3V2386979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0057efa33d58b868049cc3cd83e7ae9a7bcf72e708f168fab7a0fa5c3afa05. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/USJ3V2386980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2fd71de583f3afbd64333f87941ef7f2e7bb2fb9a0de51d2fef86ad66bef58. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USJ3V2386981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60e177db9137fdf2fdaf0f361fb2193c5115040722d147c9e21752930d57631f. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USJ3V2386982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7352a9fc100a00b2c0b33f55bd49c40d74dd5705d772717acba66040c4968825. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/USJ3V2386983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb2d0615a3eef482b8b671097f3d44e1f65912cd373aa0082df8f9f03d977ae6. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/USJ3V2401422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe52a4053ce18ead927f63a31a426e822205e2276d1fcd8ec8f9e589526de0c. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/USJ3V2401423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3095b32d595cb758c7253f5df0d712739c342654eee99b9e55c3c53b03ef97db. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/USJ3V2401424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5528558a1f1ab77a5592c9933adddbfb9b0a86519fa13e4a1191d6807ef88561. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USJ3V2401425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c6d3e00145094c4fcae9f1d069924fe0cb1cce9907e87f2a2f7b762172f9f6. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/USJ3V2401426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a53f5e2800564ae45a7436a356ffb1a46f24f775be13440e47c9f7d2b8bd21. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USJ3V2401427.