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 0xd55c22f8368da08d0922a6a27953e15298ed08f87f5381d6c54a360d38c77bf9. 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/6fb4e8d1-2d01-412f-8d04-984303b48400.json and https://artists.proofprofile.net/proofs/artist/6fb4e8d1-2d01-412f-8d04-984303b48400.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 0x66dab0706f7bc4b32991f0bdea4cfdc9f1f295be59a4dbed64642be383f0e9ed. 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/QZZ662455774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x515d5a630a0fae79e26004a9aa2e0bec13a3bd8f57b9d7266bb76064d19bacd4. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/QZYFZ2368366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7fb82955c6bb3ed1f4d91f8a5d282d6dbf23f4fdcab8dffaacb617f43127b7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZN882386512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34d71586798ef822446600cd94db13ac54d2b03c305bdb468976861438b83eb5. 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/QZN882271756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66fabe96ee139fcec9d2268e633f89d1ca37feae853e39c4bcde48826755544f. 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/QZN882313703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b296c47ee3d7cc01098b9bbb10519a192a82439dcee6a6ffe8502f7db60c8af. 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/QZN882313704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448095df7f5d1f41845940058ca830d06f817a5a8f52663767c5bebde451ebaf. 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/QZYFZ2392348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa47c0beb869a8c99f71b67ccb0fbf043af3b41b694377378305d2b17303151c9. 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/QZZ662339749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe818046113e94908f904af3da0aca1ce017bee872949c4a842b8d1ddfcbe3696. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/QZZ662339753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448095df7f5d1f41845940058ca830d06f817a5a8f52663767c5bebde451ebaf. 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/QZYFZ2392348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb11619f09231578c270ca20eb800506a4730b88571f85607833015fadcd71b. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZYFZ2314633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633b77d271e56cb5f59afa0f8440af24e6d389170d0f073ee97db80c466147a4. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZZ662339741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x700e3ff0680c09511d7534907daa238aed83a62ced8b6a603525bc834891e860. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZZ662435719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc85c184aaf6891902975711b73677cd54db9f4eacebffe01e431b3ced155cd9. 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/QZZ662315517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf53f940a88a3a519a14a8dd324c9ba132c95849a4032a3ae3a42ef51bb8b4f4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWDW2308881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8373c66e209a98fd5ab7ab9bac1ed5126b11e507e528949fd532af133435c9d4. 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/QZZ662372084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x167be5ed5ee7960e932a63fbfc667c7b5b66dcdc712fd72c101f357d1755763f. 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/QZWDW2332572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f0c855bea7d0a5dbcc0b34186ef0294f61eefe074394770b78cb6b8eaf6ddc. 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/QZZ662318926.