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 0xdd146e38f36df9d80196da815d162ed6010218e543ca9a5b2f5f09c7afc91273. Chain 2 (Bitcoin): anchored in block 954072 (2026-06-17T08:43:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7abc4336-4dab-4f7a-8577-c945564901a9.json and https://artists.proofprofile.net/proofs/artist/7abc4336-4dab-4f7a-8577-c945564901a9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Concerto for 9 Instruments, Op. 24: I. Etwas lebhaft
Webern, A.: Symphony / 6 Pieces, Op. 6 / Concerto
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 0x64ab4000150f95b691f508aa89553504046d36910d90828828f460d492109b9a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190453634 — a six-check JSON result.
Concerto for 9 Instruments, Op. 24: II. Sehr langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fcc9ff16e81a9cda7237e4022590a5511302c919044223558d0123ecf8dea5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190453635 — a six-check JSON result.
Concerto for 9 Instruments, Op. 24: II. Sehr rasch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670dfa3b864ac3a60fee660cf026fdcf1894eb494b572b8e6c5558befe4cb77d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190453636 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): I. The Soldier's March
Stravinsky: Histoire Du Soldat Suite - Renard
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f65e9de608604390997a4b4a1d28a1cd4e3c14669a59cbff9a6b19aee88f29. 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/HKI190620902 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): II. Music from Scene 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94c57499348b48779237eeed38fa976c3416f09745099248c9cce6876bae7f2. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/HKI190620903 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): III. Music from Scene 2, "Pastorale"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe348955d49b1b54a7f7efe5b9de06db36f8f695f5717577b3bc3bba82898bf52. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190620904 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): IV. The Royal March, "Pasadoble"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd1257a6dd2c1ce1062edd178c2e98a701cef58c2af2dede9cf237783b7491db. 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/HKI190620905 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): V. Little March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3241cf20ea44779d910989e1269c1bfadfb31c46a6c83d0c5b2189197f13ba. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190620906 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): VI. 3 Dances: No. 1. Tango. No. 2. Waltz. No. 3. Ragtime
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe16731f96f2629c243833b8b58be8573aa8fb71729515dc136d79a9df827ece9. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190620907 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): VII. The Devil's Dance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8883fc8e102e06e12fc21af271a1ce7ede7cded273d8abe66a719b4e09fc29d. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190620908 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): VIII. Petit / Grand Chorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbda1c177d9ad6b928c6355a0493245ea6a27750883773e89503aea2aeb1fdc5. 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/HKI190620909 — a six-check JSON result.
Histoire du soldat Suite (The Soldier's Tale Suite): IX. Triumphal March of the Devil
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2dec43a30520ef555c6372d2645064f0df76d103d277d5baa0046159d24687. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190620910 — a six-check JSON result.