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 0x082efd301fae0217eeec955bf9fcb92c00c0b7a395672ed1aef22c07586779d5. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ab4eaaf-29f1-47c0-8dc5-9ce202386fc4.json and https://artists.proofprofile.net/proofs/artist/7ab4eaaf-29f1-47c0-8dc5-9ce202386fc4.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 0x3501478d792ecc59df8b1126a7656f04d759765fc505b33a7b3f79f59c08d108. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/QZTB42337923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69257f6d182aa152105a0f3d6c634c50b9a3eb61916eaf1f193212b1e14643fc. 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/QZHNB2313335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b908630a22301c2c0b3c9b8dd8bb84e877465fbd7f076954a345057aa9e373a. 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/QZPLS2253300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe33846e45c74e9eed21f54a825631854fea461c278eafe387e4d0523c9a79007. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZMER2270290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3dd88a6d7b7c777da9617f71865fa1ea3c54cfe294b55c4ff797fb98b134408. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/QZK6N2258066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d90884291c2c296dd9b17594e0dfb1bd8f7b98236de46c8a2a1ca5d0c5626c4. 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/QZES82260093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b996ac3e28eb790912e057affc4071e7685294b43bc712c3d2ac2850954a439. 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/QZFZ22214295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6cb39c16b9e51ca5a05433526dd8292b46f6c6dca4bb4acf97fd05bf4748873. 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/QZNWX2151787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d6e694671ed71be8d8b6b6518171eb0612840e4c5f70f12fc93ad060b548c7f. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZMEQ2127725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103bdc2a1459f0256b26f60114b576ba325b2a7b5f9ef1c9d045f804bdf1224e. 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/QZK6K2187391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3765150c56fad08b31c35d3081c57bafc139996123382b0c1055226bb2b3cfa5. 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/QZHN72152170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe07d2819557a9f4b794e3804f96daf5007a063841077ed011fa1b978feb249fc. 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/QZDA82179702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1e8d88d99f33a047d5f7478de496dee59ea5cfcffcd24ccb0d61122ee1bea8. 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/QZDA52386660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ef7f093f3d82af311b32955c18105a2ce64bf3883c31f2996f92c3028d3994. 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/QZFZ42182661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70cc6175ec0277f89bf8cfbfcf1591139155ddcc2d56617c93b3668fb96ffa30. 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/QZFYZ2100522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223481e44fe5402cc903ddb79cb7f37706dc83579df6e9957efdbe88904e8c73. 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/QZNWW2098677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c61786e985219916948c716d366af465d52ee1a9f756da74e8c0b883e23057. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZMEM2033511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa4489b804a3a7213c272773d4d664031f8be39556a4580aeba71585b2a0142. 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/QZK6N2098579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9c6bfd62b6b499320d30e0a19578417979ebcc0092c6c6954d024d088aede4. 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/QZHN42038820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916264c7c72bf8455d8b97be08699370e98693f5037027846cfa582a7830239c. 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/QZDA52098898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b4da1751cd3b2cc504bf03cfdde9ed5805392d2c45aa12bb1af3e5c8b55d962. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/QZFZ32022434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b158b43a2c1a887ee87819883247486e0c668477c7a4a5c0eddaec0d705a9b5. 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/QZFYZ1920672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb6c6b09af2afbd3944826eefef0c760d43db4177eb5394afa84e751f982463. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZNWS2410896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1a921fa4fc8af80ef5df452cd920679d2c5be53c40de2af9d82c2b878aeec9. 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/QZHN42427765.