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 0x778cf18cf4cc95717cf1332b0ea38204148f9ebe4d8188b9d0e2ea11b6fd4a11. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/421b1def-8676-45c7-a959-547759b03230.json and https://artists.proofprofile.net/proofs/artist/421b1def-8676-45c7-a959-547759b03230.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 0xf4caf7a880827ca51fcd82d92c8d8ac5aa0c3f1b69d5162705f1445ca6d9457d. 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/US78T0754532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x867d88036785d54c5f70f4831f6a468b66009c1e8a562425b3cef8f45c2e5d67. 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/US78T0754534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b4c8225459a56c48489ceaf162425ce1d156db3fe001500ec2153725bb2693. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/US78T0754535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0915cb87a8ff7e5b7cd6d190e3b7054587ab332a0bcb82615c07280a5c6f1d6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/US2Y30761462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb667995e061d9f6a562c921e9ca2504769f04ee3fc3ca677eafef88a429b3e4f. 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/US2Y30761471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe669e1644ac989215e698261f71d9379e3b1d2bceedfeefd83cd02cc4e481a9e. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/US2Y30728532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3ae90140096784013bd311324de121de44fd66baabd5b4592fdef68a0267264. 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/US2Y30728533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bf94b898821329e26dc846dbaf7a9c53ee5448905300679f9cdae0c6f467466. 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/US2Y30728534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878a66dcfe078249e714bab7681d8a5c13a4432efcef9a20a458b14414da1546. 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/US2Y30728535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa54842948ab8da6a32eb244ea00d1b2aa420250b2ae9ca4608439c6c703ef128. 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/US2Y30728536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383bea90d434810c71e4cfb2a6f56b2b5bd1e61f8e576f14a2df33264836821b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US2Y30728539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f51e76d4105e1cb6b1ac2950ff974f976c3dc3d9b150f3e3d1114c521ae0fd6. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/US2Y30634884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f51e4ad522daf10961d78a206586ac8fefd082a2d0e5ae3148f6a1f1da9da7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US2Y30633488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa948fba196de92f9824c976ae1bc2923913fafbd1d255bcdbdb33d2b556738c6. 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/US2Y30633485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f8674f469f73f29aa2639ead535d0f5f7ce491f4d4d78054c7d6407f6d154e3. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/US2Y30633493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5af01e0b13778f48bf7fca2964134cf2c6dc8af67c05d8ccb1a2cb3ef3c09bb. 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/US2Y30633487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f81c63f786d8d6a0364cc0c343e687258b7cd493aac93943287a1124e21ccc2. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/US2Y30633494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aaebaf5e94ac956553b723a47916fe3e522f85e27a158e323394f8105dafc9a. 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/US2Y30633492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352b20bd169d76b43df0a9be12d2541d9dc7cbb9ecf722dc193e8a28c8b9ac78. 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/USBWE2011516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d917c026bcf0fd55cfd9f9e678a729bdf8cda5ad94259f87129aec186094a33. 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/USBWE2011518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74145e51ac2a72c5b9f76ba7fb921769dd2d2b80faf9e606a2783162fb0ecd6b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/USBWE2011522.