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 0x29916e2ab04617d019faba063fa5a29f1c1453d007ad4cabd58b5fb13e407cc8. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d683b2d-fa2e-4339-81d5-8a8ab1ae0517.json and https://artists.proofprofile.net/proofs/artist/9d683b2d-fa2e-4339-81d5-8a8ab1ae0517.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Beauty of Classical Chamber Strings, Vol. 1
The Beauty of Classical Chamber Strings, Vol. 2
String Quartet No. 3 in G Major, K. 156/134b: II. Adagio
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 0x5991d018615e238816e15be860811f138405be91c4bf5ed21642fc8b3ed9bc25. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/NOAV61704741.
Haydn: Emperor, Sunrise & String Quartet No. 3
Mendelssohn, Dvorak & Haydn String Quartets
Haydn, Mozart & Beethoven String Quartets
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e516c41faed350874470789d87599e1169664bee6ce51f065314250385a4a1. 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/NOAV61701031.
莫札特: 第3號絃樂四重奏曲 G 大調 K.156-慢板
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5991d018615e238816e15be860811f138405be91c4bf5ed21642fc8b3ed9bc25. 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/NOAV61704741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029f9f4a7af3a1ee536199f683b8fb6c7f5d18c90935d7a6d66fe379ae7ae285. 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/NOAV61704721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728c797678b932d74c24cc0cd8a4c36a1c187ccf1cf6386a614fa892dbbb376a. 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/NOAV61704701.
莫札特: 第4號絃樂四重奏曲 C 大調 K.157-快板
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5479d40f5b5bac194d252cacfe12e4d06b735dd1dd2712000d9be0eb4cfe038. 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/NOAV61704761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9a6bb7e8f5a4e90a3a10db64784c838676452b4931578322c54d849b356e875. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NOAV61701131.
莫札特: 第4號絃樂四重奏曲 C 大調 K.157-行板
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c05ff4dbe99999ed6a231565e7622d7f4e80fdf10d581208309fd41e14c13d4. 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/NOAV61704771.
莫札特: 降B大調第16號絃樂四重奏第一樂章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44751bcde19289196bf722f9fe5d42417f9e94e804ac88a2c11a7840f8887441. 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/NOAV61704791.
莫札特: 降B大調第17號絃樂四重奏第二樂章
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x911fc4627ccdaa1d43280d5ef64443507902f905d27b905b2bbdb447c5452ee7. 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/NOAV61704801.
莫札特: 降B大調普魯士國王絃樂四重奏甚急速地
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94ab1611056917bdba42e4a5da568c4bc9611bc66e8cce3e74426767c8feb632. 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/NOAV61900201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f76bfcf669c958f2e15c16f132ea7a4c8af3e9df1c606531a9ce5cff20fe76. 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/NOAV61804181.
莫札特: 第17號絃樂四重奏曲 降B大調 K.458-慢板
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a0271697396e45b3263ad993f116d5c4571acfa5b3dee16c95c9f454fad683. 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/NOAV61704811.
莫札特: 降B大調普魯士國王絃樂四重奏甚緩板
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1c7cf13f9a884f59deefea1878056f8274b2c279d85e55b2b9a61d729b0be9. 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/NOAV61900181.