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 0x512252592f4fde0bc92d84a623254eca3bcb0d3619865b013a596caab0fef82f. 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/3020a833-4c52-493f-a34f-85d4c2f38269.json and https://artists.proofprofile.net/proofs/artist/3020a833-4c52-493f-a34f-85d4c2f38269.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 0x5a8a35ebc1e067259d3f37023e329df40c86651cf0a7f4e6663365dfe1bb7476. 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/USHM81502122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c518872ec1538d2f69462795801c6c48db8ce7e7923f5cf05634ab4826bab5. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/USHM81502123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0db75c16a738ac3749d7c31c1d535238c8fba2b8993811efd8c4255bb52a336. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM81502124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5042e0c30e4af8a32fb9e813e7952fc6d2ca5e409b93287a351c8ec047243d. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:55:33Z), 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/USHM81502127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b59b223b2d8937b701d178e1be74d1cb1bad1971098fbb61746975099bc3d7. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USHM81502128.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98edc06fea68a5a0b1e11a20f09938e14e9adf3061ebc93069631177c119fd48. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM81502130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x300e0dfabe5a119b93132e248da81b5ec09e063c13a16f27ceb41855f9af0478. 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/USHM21643101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f6423972c98b8da3d73b2795e0e5fa37c5bb2e1c99df2bc48720a56e10df97. 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/USCGJ1911753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853a6f98979a6a2214c2736a6345b4bdb0139613aec22d90b8a7d2529521dc2c. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/USCGJ1911754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf146daf0ad97e0c7d035306cb42521332802e0b6c874de83b7bea8b05b36ae75. 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/USCGJ1911755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe8492299def26947d4ec35a621e33760655b1411ab935473e07c4f93cf738d2. 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/USCGJ1911756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8618d8f2919bf0afadd5a4f33b05c1d19d05e8026180705f0a0ea85ac63b9884. 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/USCGJ1897616.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fff1986382cecef58b68f0fc130734e8fcac095f1177f27a8af9d3c5abdc5c. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USHM91825150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4d1dc8d19809a0a89952870d254552284144439b342c785a2e0fb3cecef0d13. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T20:08:59Z), 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/USL4R2081187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcde3098e83b9cc73be6a7bc3b7e62595af0244ac839d26b0d97dd51726b46fb1. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/USCGJ2131084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6faac21f34bb023d2cc2ad0d38203d3bd314f52b0197a378b061e65d6d9ebf6. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCGJ2131085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a2fa90e2b1a11e2225ab53ac49d2a2c5e222d6bbba1d02c45f2a87b4b8651e. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/USCGJ2131086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16223fee9f354a82fd7658f0895c59e4db2ed7f6ede658190fe6b2d2fc1edbd0. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/USCGJ2131091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x730f8f181ee5d6fbf434043f08fcc42929edc92913381ab7223781af2f8db8b4. 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/NZPB12400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2baf574ff40d99e9dd7fbf3b53e0ebf1769db95fcf5969a50b016fb76e9e49. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/NZPB12502880.