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 0xf2d9b1ae4e50dd6cef743538d9144fc87c1c8b331c5ab2eda97fe406b7f666d8. 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/b147898c-7f3e-4178-8719-0d4c73f102f9.json and https://artists.proofprofile.net/proofs/artist/b147898c-7f3e-4178-8719-0d4c73f102f9.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 0x19b7431780ed6055b9c200c561180ffa83d13900b2aef86dcab93b18dfa167a3. 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/HUA611802297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb99b9105cb50e7ed83e306d3eea3e36a0f6d65bcf0d5697a8378b284d2fc8b8f. 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/HUA611802298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417b59f6d1a691622d0968b4fcd4336f91f8acbb6b052f3233042d0ce405e7ad. 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/HUA611802299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89442308d9e60443f534d8f2438c38f6273369fd19dd439b973032bc8ef3b777. 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/HUA611802300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d3699b20d2e6a4b0323a07d566eb218d59e435cbf27fb0546937ecf0e31a3b. 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/HUA611802301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f0a8c48d045d39145021049c286a0e91681ab2b8d7bd1a3f712c0b588c8dfb. 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/HUA611802302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390846383e6aea9195a2c9c19dd4650a9e85ad882b709c4581d3393b53a4c791. 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/HUA611802303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc945e2d77045ce9673734dd8813706641d91ea4acb2f77757ee08fed8ee6dd72. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/HUA611802304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2ddf95c772efe337004d2c2b0af7990f1d3e1cc3174cb6a853ecfbe24b5ea2. 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/HUA611802305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa53de078b91558b0430e2e280f254edd11f8b4ead7dd445574ebe1b00f4d9e69. 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/HUA611802306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9033014cd81ef87886942644ca7a03f9c538d16e3b9a9cd1f9bd5a445fecdb2. 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/HUA611802307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ecaf85cea100f0f3e90a757f6011ff81190a0ed660d88c49b68e972f7794a0. 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/HUA611802308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcee5f4f9b13208e6cabb6a9ef92bb28c3fa0a186fbcef78b1134c199c2f2d64. 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/HUA611802309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd227582d71b161de19c0196475f01d4e0b02fe633f345081e71798ff25f75f7b. 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/HUA611802310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc54677c7214df19c4b922653bbbc1233487fe14b19461970cf219244f7731278. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/HUA611802323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde24ac52507920b1a7da8ae4b5bec3a3798cf35258927f65bb1cf68b159fe11e. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/HUA611802273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c239a8eab13783a07e730f2863e1f635ac926eac792bd334927f44d17951b37. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/HUA611802281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffeb8f4a17fe4527c34f8b73abaca7a346a30c2e0c66828a81ae10fc5acc39c4. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/HUA611802282.