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 0xbcab1ffb24d3bef83ff49eb976e84a6de5af17f706678e3a6bcb89695d4bafd1. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c7eef5de-1e97-4863-97ca-8865a316327b.json and https://artists.proofprofile.net/proofs/artist/c7eef5de-1e97-4863-97ca-8865a316327b.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 0x7178090b9cfbe86bebc7af181fe4cedc02fbf8ae0f7f3a829c0420225a604d1d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNJW2376855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0036e369f5d200d69e2b867bfed9364db04e93686f7e70997ce40c969eb0cff0. 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/BX4IU2414178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c2aa42e26c7978c18ab09168de72f7d080fc07408890dc1bdb53007eddbe080. 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/BK2242401535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x097d6d9ff1c67257573f97e13a9923812524cd3f7bd4a23bb9cccef25f598a5f. 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/QZW9K2447691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d2006d4201839737271f5eedb2860987a2f52a83f25bd62e88dd0d6e3278b6. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/BCZ582500051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638d2bcd3d1ffe3f292bd6118fbfe0e5cc90c82ddcb0f2ea485bd2ccde191b85. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZW9K2448130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495dabc9d79a8a468f54300687d3ebd7f4f4dd1e31cf041a4a0aa8efa4b2ec87. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZW9K2447633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6696a2be86b377413b9af65a2ba40c64e932f4e55c2acb3382f59c8cd92e4ffd. 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/QZW9K2447677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27341118e65ebe1cee8bda54c18292341c1ab2e53351a83087692314218d1619. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZW9K2447674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60a24c88077a424a8853d36ca55bb6522bc5b50731916a757b3e1708a5e24de2. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZW9K2447671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98edc8caaf3d9a9daeeb18a265a6c53c03f8c086d612ba4c78b87a7e9ed17221. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZW9K2447670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x605091a26e23b238dc8c8dd26b695ddbdb02bf7a93d13d358311fc9ed94f342b. 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/QZW9K2444206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef65468ed6f8cf1e63caf0377ae826907397a87fd8961c26e0a2a2dd827b91dc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZW9K2444217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874254c07ae983c98aea0f0c5de315522081a717f9c04e74b7c9aa4a5a3ea429. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZW9K2447682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b919e5d66dfb4ced663a205a3d59157dfe4a11092e8b587767712ed456c049c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZW9K2448133.