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 0x20d055d39747c838b95c0e47a16ca22debe6a3903cac9ee76b75165e59280b9a. 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/cf9959f9-b83e-4e94-8776-3137ae985ef6.json and https://artists.proofprofile.net/proofs/artist/cf9959f9-b83e-4e94-8776-3137ae985ef6.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 0xe417b06f765f5b89b6cc5a5f9f8d54bc074c90dad5c6ca1d6de81f278ab49a8f. 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/QZFZ52090119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113bee6fe5eca909c0245aeec234c2077800e5dd581011ed3260b531b6215df9. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZMER2035992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d00d383e14bf06babf19e8e0343068ec91a052acf8720545b4654a26da144e8. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/QZK6G2174667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0816a68fa5b4d6fffa6d40839f155b1c0b48295b218ef61c91ff8ee67ca12f69. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/TLREW2220372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c532d4808719a71ac952ea138e004058ccaaff9e4da7c5c1bcd52f02522c4ec. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/TLREW2225982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ca782980b99140c4b0d4c2f1197567c84dbcea97acb60c2c7a53a07de799e5. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZVEM2305764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb814fd17b7fc4131136a95b2c058164962d8dd6993041c4524fef21f7d9a738e. Chain 2 (Bitcoin): anchored in block 958498 (2026-07-18T04:54:58Z), 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/QZPLS2461127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75beb03e559b11fc6ad3a2284c1da845ef6943baf23a9b1b66c1ec7a384cfe18. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTB52489461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdad12a6fcb98ff0f4833f0d8115942e3cfbc7bd00ff2be713e6030ca54efb3a4. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZWFU2427567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2019891708f96063d881a12480ec478d1487d15b1cbf278478e7cb8ef427c84f. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QZPEW2520070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88ccb36062518f86caa95c75f1c05702ef39dc9fefe113b8c1cab57baa8795f6. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZPEW2532926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb130dcd633878da6d8ab10a038337e05b2d9983e310dc6ed1443cf5e2e7b326c. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QT4K52512003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29fdb77f38003ad9407530c853f21c8e4365675ea8cf964304b085232e6f2cbe. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/QT62U2501986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd15c7f65bfde960650f74055ab1281c74105198a94b7ca6ac5ca93d476ba45. 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/QT4K42592722.