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 0xc6a47f2d47063f0016db426f79029bf8bdbcb70f801ec9dd7c64185d03de2f10. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66de6410-1fe8-44f1-9fa8-085aaf554d08.json and https://artists.proofprofile.net/proofs/artist/66de6410-1fe8-44f1-9fa8-085aaf554d08.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 0xbbbaa91e69da8d73db7f2954fd03946e70ec4172ef21eb930c4a5b30c15d4e36. 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/ES09S1900423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ba0144399f15c9f88ca35f1263dca15b5f9fe645933e8b049a988358ff7572. 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/ES09S1900425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e50ee0af1f42259fdd3748841eafbb377283e3c1c36db6c92e9fe7dc5bbb3b2. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/ES09S1900429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c2ca98d59a220c557699b1f51e3b2d0f36800158dd2ec86e983da46bfa1ff0. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/ES6102401087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7724ec0be2db263386c2334fadaf07fe886e2baa6e9bf31c168871a9acde7d43. 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/QM4TX2351876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f51fe8b00fff31ba5e9013c76d07ab6dffc9fe1022f4ad86ffea0caeb8a561. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QMFME2030923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7faff34297d7ebafcaaf6e131f37eb1590b7b0eee0fbd1cd5051e7599106ed7a. 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/QMFME2030924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34dc4bb59450466689d273b26172b74d9dec088ed06fca0d358179025f0f70e2. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QMFME2030925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4998fb1de665e154c10989586ff59bc3fd25ed747d285a08e892a41e62107692. 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/QMFME2030926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79ab9f29eb2f3ac57b3731a72be194f43b519b2b0b7f86138db607c69df6869. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QMFME2030927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60ce6018282039382ef759e178b1c5986c4455af121b650b51aa9d5af1d3693. 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/QMFME2030928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d9b32abb367070df69c2eff92e61fc112b4226c79bdaaecf3806cca39f226a. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/QMFME2030930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b7bc590a9b0da3052edab6072d2a7b6147fbd335935ea1301f777d7876d0aa. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QM6N22453365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba036f247b105bb32bcefdff5451c779b6075ec72798be622afb233209b7e31c. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QMFMG2319610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x988dc39f72232371fa174f74a3c2bcacb1e79c0eb2821d01b8944420ebd8264b. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/ES54D1800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ccd8e82282161dbbeb6e8bb19be390282ebf5c6996c2deff48bf1daf37e167e. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZTAZ2276251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00779323852b71a3c0b95ec166b3215b8e84c4bb4918bba17ac4212f1fc51e37. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DEXN81800210.