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 0xf8e4fdc5816879bc2372f8b941df8c6ce95b7ce01e90a8b4f067ab54edcc561e. 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/252d3636-0a90-49a5-b276-f1fbb6369103.json and https://artists.proofprofile.net/proofs/artist/252d3636-0a90-49a5-b276-f1fbb6369103.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 0xb1f1081957614db9e664caec2345268251cfdc6779994e1713c54dbd87084431. 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/BK2242401770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ea647f594ded7efcf26e0a76c5a05fb1c65ede261445b2e5daabd89860644c. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/BCLWS2402249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43649febe235ef630428114282c38c68554d342b2fc7dadc5059f0ed236a942f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BCLWS2402250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc0fa405fbb2ef42efe803c72f2c18b37b9eb230e6abc7c8ef1b6c01827123f. 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/QZNJY2401634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7728f9687ade9d3f6c9ebdd71c005b601d5bdbed8b39e08e85b7294f86a633d. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/BCLWS2500814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbaa4ca7bd43bbd9c44c2dffa4ffb4afc09eded637dc09326d89d0e47417a1de. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/BKR2K2500025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0839e8128091bd4578529cdc74b0eb6aa5c88f24c7a4a79e98befcf460f727. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/GXD7V2530854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96b0a11526096ff51c019e1d49e4818d869a3da78858ec42c7d3c413ee52109. 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/BRKO12500196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa318656f805ef51dec2e582194e39083fe37b96f9d985707628163526fe1d969. 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/BCLWS2500418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921b659ab5d4c2f9153af1adf3151bd8648f17ac35337dd43fc6204b954cd7f9. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/BCUWS2500053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xade96675072a6eb1ba4b3a478c277fc534860fc815bf9d2165cc053e2388957b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ES47F2401731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a66aa349a6689d45f2dc277de8e5b09b96b7c89a7cc9ce579aa8ef3d71de3f1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZMZ92459759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679c606637f032d81fab64a6cdfd432466c365c578411fc936b2797f5c63c3a7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BKEP12400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0caf7d1e21fd23c5df77370c5016832a32447899ee70485ece8e2cb9d3860436. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BKHYR2400052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd5b3be0e96a72d273db1824696fc71f3b785f7ddaf42effd3cc22cdc8901d98. Chain 2 (Bitcoin): anchored in block 957043 (2026-07-07T13:52:39Z), 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/QZNJX2440923.