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 0x54c19ff1f4f9d17926ec4db6a6afff0ada166e3de15e81be440815730703fa59. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6f8f1172-b2b0-44cc-ac75-9ee903dc0394.json and https://artists.proofprofile.net/proofs/artist/6f8f1172-b2b0-44cc-ac75-9ee903dc0394.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 0x5197be1a983fc30aebc6bae223a3333dce02962baac6237fe0d38ad053117ef3. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/US2X90710001.
Musterek Huseyniye Gecis Taksimi (Joint Improvisation)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aea5b2feee90b1d6b8a7155f520dfde18cf037b4ab152723d350bada5dcfb59. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/US2X90710002.
Ussak Taksimi (Improvisation): Improvisation on tanbur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fbb95e58195304aa417364c0ff740cb42480be1a2354419bc54a29ecef1e1c6. 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/US2X90710003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077169971634c176c9f0de7d41076ea51a183a63523afb5de81f34d0ddadc74b. 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/US2X90710004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f618f140409649f0114a88b7dc525d22117923fc9bbc9def772c4ad755c1dd. 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/US2X90710005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22d08f9a1ed850df966f9b47bd17fb006910cdbf29a9642297f6c67d87447cf5. 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/US2X90710007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7d397bc99c9f797d1275f945ba7199a0914ce11d74a7a31843a51a72141da9. 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/US2X90710008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb35d452b5df7d50449514517d6355f14391201b70166c30b11b739ba1894189. 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/US2X90406001.
Sultani Yegah Pesrevi (Tanburi Refik Fersan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bca35398fc86f28c8c50150be05eb98ada910a96cb5c7aaa8b8ade5177f7312. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US2X90406002.
Ferahfeza Saz Semaisi (Udi Serif Muhittin Targan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8c3b843dd8835400b3e47b2620adb68dce10fe4e3863e3b48851cf264d173f. 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/US2X90406003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bb36d6ec88c7f87f9c508843e5aecf092a74ca40348b24ea316a3f36bd576f. 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/US2X90406004.
Acemkurdi Saz Semaisi (Kemani Cevdet Cagla)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0b0096b14dc2c9925c19457b578e24412518c214b3cab2656733844749d0a0. 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/US2X90406005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8436acbab0de1932db3f3269e9e87e666261b728bf49c874f0d034726d320e. 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/US2X90406006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e14748417877b0ded799e66240b6859a0438be7cc1fc008411ff769ef510e72. 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/US2X90406007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90798e752bd2e8f4119b1c625fa97f6e61576625be840e412848f51e615bd99c. 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/US2X90406008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbff2a0b517385c6f4d88d03bafd7a199f62a9913027ee043454ba8d9e0965abe. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US2X90406009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe777a9843860133da7e14b071db58c9b1608b2ac96868171917978d804e408. 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/US2X90406010.
Suzinak Saz Semaisi (Kemani Tatyos Efendi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x998e730a45e098e88352160943d68c56cc8945b2ba16c685fe4a9e92693c949c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US2X90406011.