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 0x8fa5a8bbc8a14d4282153cbde0f158fe3fb11cf5c31fd712b12c9339f84fbac7. 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/938a812f-f45f-4c7a-a5a5-6980146a8051.json and https://artists.proofprofile.net/proofs/artist/938a812f-f45f-4c7a-a5a5-6980146a8051.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 0x5d8d4726c884520fdd5769243923609a944b7fe0cafc4ac20baa3d7a0f58cf50. 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/NLZ542300948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48eb6e40fc0cea4fdf4fd73e0b5e36290adbc87111836d9c3240607bb02c313a. 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/NLZ542300321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b46e9f752636485e99192d8976a49618f527504e53a9992c5f159d90ef54f66. 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/QZW9L2295420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ecc67e6ec89061b91c6c1b1d456bba7d0628788ec6884d9498aef705d267faa. 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/BX1K42200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03285a581649e447eafc8628e84354a9ee512829063b9c7e1bfe7967e90be893. 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/US7VG2316615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe927604b11532a38dd9216ddcb89b7a0f0277a83e115e941496ae11b06e75f29. 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/QZTPX2194080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ee83f686f058745436b617064f9889c20da8b510b66e079d8bc7ba6a56243b. 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/NLYK92100147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8b2cf526db846502f2e1829e5438403359d3080d6377c43912ab15d0fb363f4. 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/QZNJX2122102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82dd06bfc7f37464afe6c554c5d76c428d0fe4894d56650fda88ce324041b243. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXHBP1901062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41010654fa067600306fa432829695aee6521d9afd840ac1180d299e823c2fd9. 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/BXHBP1901063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f28d0130d411de9a85d8e536ef533e8e8291931b3cb016e55500d423a23e0cb. 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/US7VG2322188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a621e6369de306bdff88ab8ff4d761b20f08a30e44b452805ccd6ed8652a558. 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/BX0BA2100097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22489b27be8b9d5d12f1e1780b633c7de1577218a4a65df183dac36f34aa66c. 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/US7VG2324030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85aca51ba63bd274ef1c188e387aa70a83ee0afe7132a29658eded60345462af. 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/BX2LP2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70501da3286093256227971a0b927c67eb9d1cc73b641a2c22b2e303b5f6b538. 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/BX2LP2000039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d88f0408f82c21bb2b78fcd68f9c66e164234b3001d71671328b74fafed944. 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/BX2LP2000061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd073fbc3b48b9373d9be6954d89dc591aaf3a5edbb51cc3bad1ffb31b0b4a0. 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/BX2LP2000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fe20d97d913173c61736d44d3b5f69b5115ecd0f161f3ba3292fb074718317b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BRUM72302170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x016093c753e60958d02515087fbffbd89e1bc5fb66f65933a38aa1a284e0564b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DGA0L2391817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bde6a439c26e9e80a1d4f3e338ec2ec9962d5b1979c88997a242bdc099f4a3b. 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/CH3132300641.