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 0x7453556bd5cb9cb894db637dbb8df4f548db208276ef58b540df0638929d3c57. 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/1f0ff793-d210-4346-bdd3-cccf4c368ed2.json and https://artists.proofprofile.net/proofs/artist/1f0ff793-d210-4346-bdd3-cccf4c368ed2.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 0x2abb49e59c82edde73223c4ccb30fce5247e59a91930e9374a477aa11076617d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/FR10S2201500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333473db0722716fbdedaa1357932b4ea9cb5da865c954f04493b6ad8de94f65. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX452274812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4393d535a43ad3ac030d8a80718dadf87772ebf591f089f9427fafd750644348. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/FRX762214452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369092a93da3d90a99144dfbccf2314b3bf28b68520a720ec3cfcd2e073cab2d. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/FRX202303403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x307c29466c43228a23e3a5fa1714ad81798c258ab8ed4e70eb66e668bb607aba. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QMFME2397349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87dd7852efe6e3fe1861ebb5b33b303f7aac2dbbc7fae175e69a0e3a5026f787. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/DGA0Q2381966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb3835b52df0d4076b64f629f6b937e4fa6e7e94e34af0c72149c1384d291df7. 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/DGA0R2302789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a99101c9a1c9b3044049e972134d6977ef4c58449488f2a68d4125f30c5330f. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QM4TW2487125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63136e0dce187d0b72550def12a0bad36c50bd6a65e8e46c89661a3a52df276b. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/FR96X2472773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ed466ccff4b0931aa341ef4d66296ea641b0865ce3ad7eccbb9a84b3d38a67. 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/QM6P42440655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d56fe6c1ff26f45c4c0e821bc771ac6c48487662e032bb3a9bd720d894a1c9. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/DGA0H2401274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c807de5a14d86955de1bd4404469668c9e5d92ce1e143c63ce593f71f386e7. Chain 2 (Bitcoin): anchored in block 958051 (2026-07-14T19:14:42Z), 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/DGA0L2498223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4bdf27c89f9de5ded4fe66f9ca223097a57cf93419878535915a4d9cf69159. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/INJ562400600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b3f518d8dd60777ce6386f0230bae4f7b912c189213464da7c85b13ee80ce1. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/INS4J2100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b4d162eb24301204b651d1987b45cc5309f0bd50f01626ea414ea4135a8ce3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/INS4J2000499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd840a209001efa5462493e14a9de2c1b2cb84cf2055ce8672854fc84628103c0. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/INS4J1910028.