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 0x5818f9ccfc0e02f996cdf00295068a686e40bc614a05413763acff09bbd76544. 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/32bbd524-3848-4d1b-8306-1390fbd42313.json and https://artists.proofprofile.net/proofs/artist/32bbd524-3848-4d1b-8306-1390fbd42313.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Butterfly Lovers Violin Concerto: I. Adagio cantabile
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 0x8a00e8c18729a125a0adfb789f69ad5812cc55d3e18714ecd4ced866570dfdf4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423001 — a six-check JSON result.
Butterfly Lovers Violin Concerto: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6193385abcae14d33f030d4ab5a0178943ad1f3fe5a96bfe8b3271a227ab7d4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423002 — a six-check JSON result.
Butterfly Lovers Violin Concerto: III. Adagio assai doloroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0731ce3926a113b79623f02e43c7ea59bba7aa482d0cbb3013999212d12815da. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423003 — a six-check JSON result.
Butterfly Lovers Violin Concerto: IV. Pesante - Più mosso - Duramente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46d33199f821b0dd9d85a9d30b2b8452dee7460f16beb70b7ea69256d3e1300b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423004 — a six-check JSON result.
Butterfly Lovers Violin Concerto: V. Lagrimoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c390c38825ff21cd167b055e32bf9d029b9cfdd335243b58e1a48b19772dc6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423005 — a six-check JSON result.
Butterfly Lovers Violin Concerto: VI. Presto resoluto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbcb358edd75fc125eb4d86697cbad38bf3d5b74154f4a09b0285b1642f45f98. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423006 — a six-check JSON result.
Butterfly Lovers Violin Concerto: VII. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9711dd41cf0d54047bf88f3659d7ceac282668d234acee9213cd439bb2811c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423007 — a six-check JSON result.
Gang, Zhanhao: Butterfly Lovers Violin Concerto: VII. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9711dd41cf0d54047bf88f3659d7ceac282668d234acee9213cd439bb2811c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE422423007 — a six-check JSON result.
Gang, Zhanhao: Butterfly Lovers Violin Concerto: II Allegro
Gang, Zhanhao: Butterfly Lovers Violin Concerto: I Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa876c574169f2af1b03cac3e3b10538a85f90f313c3d115cb52a74dce6fa9ad5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NZSG01100064 — a six-check JSON result.