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 0x9c8033c3bdeead427ad3147556fa796aa56ecb914d93d8f2372dda171530080a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6ac9929a-854f-4928-b9fe-dad5977a1912.json and https://artists.proofprofile.net/proofs/artist/6ac9929a-854f-4928-b9fe-dad5977a1912.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 0x9c18ef89189159f92d859916b15adfcc0d3659b98df5bbf5eecf8644d9db8464. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/BKGFL2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094c09b01df22b0bd908e705cc33b45dcde4c92ddb4b9b4914bf21d57a9094f9. 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/BKGFL2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1d0195f0873bf39fcf32d702dc7e3a77af7308430d4ac32ba3434990998a0e. 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/BKGFL2300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3828185c29f2c65cbe69d6ff73e9ff72bac23146c9c982e5c25dc7478286d6da. 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/BCB1R2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b286117df3ac9c3cd589576103d2ea1b14ef2eca8723c8d1cdc6731c010dbcf. 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/BX7MG2200191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76225b7f432172f42f04e711ebc63c0325e0baed19d8f82c39b2941fecf0b0a3. 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/GBLFP2047569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x950f36871760a626717d1394ca4bb9d918fcc5d6438146aafaa57da7ff71571a. 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/UKXN21920724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe6928f7786a5c4f8bd0c2a8b434f37cb6a0b482b110bd6f93635b01efda5451. 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/FRX452010511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a72f38de5544a0d458d64cebfa6d4b8146299b7fdb19ef527857742d784df63. 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/QM42K2031919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf70ce6fc027a8ba0772d83b67c64d75c6b8ecf8b5b5cf67735f9ad25538fdfd7. 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/SE6HN1992967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50dd32333e7d729a56460377f7a09a41699b0c611af2f2e0cc2e063177224379. 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/BKGFL2400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d0fb673498b0a46da54fa2411b3593d440fc43a0a1a83b6dd23d9caf4cd0f5a. 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/BKGFL2400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f118928d0aea16022ed642661f502a80e3162f252b7fa2be5f02b48acada39. 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/TCAJJ2574390.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76225b7f432172f42f04e711ebc63c0325e0baed19d8f82c39b2941fecf0b0a3. 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/GBLFP2047569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddac4263e93eb5bc929079f8217fc6dbc4f810e41b48d172cfac19057a85697e. 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/BXN6V1900015.