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 0xdc890f53f8e8a16b884b798e314b43a0e544f63eb2225aa38041532265fe32a4. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7b07b4f-2e1c-4ab9-b89a-e55d713bfd1c.json and https://artists.proofprofile.net/proofs/artist/c7b07b4f-2e1c-4ab9-b89a-e55d713bfd1c.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 0x3c977879aeea63bf308f10cddaab1c7a2f3d3491cb1d1fd266032e8351ebe719. 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/ESA092319136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad66ad6266b7240aced1c786949bee1a7560d9eeab76e6068fdb403c86b96acb. 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/ESA092319137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e36f4acacbe3595af644574f9cffb76c8d095e189a02be7fc0ea1193052559. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/ESA092319138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d5df1460aa808efd7dcda69c3d1ea506b1afb47800e56960e00df7f9a74b813. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ESA092318811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9949bdd3995b28adb4bd1977053fd11e962f5285c7502413a32efe77a9432539. 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/ESA092319139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f7f71198657ac903eaaaae750e9b4d4ccf5b4e8e7eba5b70cfe658ef09b88b. 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/ESA092319140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004b61d4fb4e6c0dba1ab5c601d8205e76e1c7adbe3101038369e3f225d58a76. 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/ESA092319141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9f3242442ac45757d5108eb4d20af1efb17eb3268215e5721ab927f439c4ea. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ESA092319142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcb991d547ddc949e719e172e569b97221e430f1e480322210a8e1725829f09a. 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/ESA092319143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b0340d9e3276836b824ffd79732fadf5e6d45c856d71495d7ad8584b493aa84. 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/ESA092319144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb8d35edf7ea2ddb5e67b8b834d678d948b9b1438677ef7c332cb9feab0e8b7. 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/ESA092319145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa6e4e079d2706bf4c177f2af0e12663f7b62102641a0b9d62374dcaa212a21. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ESA092319146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2930dff10bf9414c77ebd71c3991336891bdc08e7d6139d6253318698a7ebf34. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ESA092319147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310f3df1b113722b076bbd39255997da8170be653ff196902cc71b060a9332b6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ESA092319148.