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 0x3b009da37405bdc1f8c16185b82fe3c5712298991572eb72e11cbc7a2965b711. 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/1070b8e2-1e04-4b63-9169-90589d2c1a10.json and https://artists.proofprofile.net/proofs/artist/1070b8e2-1e04-4b63-9169-90589d2c1a10.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 0x821abb1ea3734bc1a894c99c45ad78cb61511cb7e992f036e51c1f1f007a5953. 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/BXY7F2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d2517e1855d2ebe1a009722ac9cdda124d77608a8bc2c060942a86b49e3c86. 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/BXTHX1900047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73bb41706d14dba7b8a499b3485b7bf8654d830a203b4b6405df4ebeb1cfa241. 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/QZHZ51925040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2af3b6f2e5dcb0c7958a64c56ce11e70c290a28f99458cc6e23f2fa88b90282. 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/BCMUI2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2af3b6f2e5dcb0c7958a64c56ce11e70c290a28f99458cc6e23f2fa88b90282. 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/BCMUI2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86b82a1156138ed8b8b1ff438e6f997ef92f0a827be7af168b20ca2348e4d77. 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/BXQHQ2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f829364e1672c87b8b851b5cc2004fcf5b4f0fa185efcdff8925d6ed9fa7b91. 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/BXD1K1900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919134368fa2f7e4f45ee03838ddadb60ad2924f07fa7b06986744b736ee2e15. 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/QZMZ92089294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa562809bae1acb14236ceba7dffae55b4ffa6815a52f725209e8c6bb7fd605d9. 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/BXP3Z1900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488d7accae1fafce73ebe7ea9da7808f558335b1fe2a33657f46b7f8b2619a29. 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/BXV602100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eeacb97333b6054e0068504c415697679fd67e473d67bd094dee69fa305864c. 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/BRCQE2200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6811dca6d9d527513cc2391fa37cbd4b8f2326dd5496e8d7097ee8f16c3c11a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZ5AB2033742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecd84a11b8750491e2eee4c3782f462ffe36b67739dcf5a7f856ad648ce1ce8d. 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/BR9Z21800203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57d330672add3b6cb4898abd9b6d56c1e2a0da832fc4d284606b5b5b840f27c8. 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/QZ5AB2102959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa058986d1615822dc95ab3a802bb6cab326278361cf9abb1c194c3d8e77650. 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/BKNCV2500003.