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 0x16fa44f4be02eab3f5e62010ea0a9595e3509d6387f147034970e7800c9c4aab. 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/8f7f5a4c-907c-498e-b60d-977ce8f283c1.json and https://artists.proofprofile.net/proofs/artist/8f7f5a4c-907c-498e-b60d-977ce8f283c1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Requiem in D Minor, Op. 48: No. 1, Introït et Kyrie
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 0xe2a8c732172fe4882de234f27e380aa3d7345b9c33b54ff0118b075893190867. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31717755 — a six-check JSON result.
Requiem in D Minor, Op. 48: No. 2, Offertoire
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ff11a0c521100cd6d69360f53c9ad76749b5d083c6815d5d01590a7d68a78b. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QMEU31717758 — a six-check JSON result.
Requiem in D Minor, Op. 48: No. 3, Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x634b219a0df861d5f1d7c2fa9bba362b2b570706356be3bd6d5e5a455620990f. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMEU31717756 — a six-check JSON result.
Requiem in D Minor, Op. 48: No. 6, Libera Me
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3365d92e5e98cf158006b1243c1ad37fa529758342ef99fc1e116a63f017cc. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QMEU31717760 — a six-check JSON result.
Beethoven: Septet in E-Flat Major, Op. 20 and Andante & Variations in D Major, WoO 44b
The Essentials: Greatest Classics, Vol. 1
Serenade No. 13 in G Major, K. 525, "Eine kleine Nachtmusik": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f26a693ee1a9a4f273a57878ee43c4d0402ac39a6f8487533cdffe172f673b8. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USB8U1611290 — a six-check JSON result.
Piano Concerto No. 21 in C Major, K. 467, "Elvira Madigan": II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb61262792cfb22d1df83fc4baf21e49965ced15382cce97aee3faf9db16bdbd0. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/USB8U1611292 — a six-check JSON result.
Symphony No. 4 in A Major, Op. 90, "Italian": I. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db8907cd11c71aa2afedab73bce2bcbea38dd7688a246e2fa2dbd1e13c12efc. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USB8U1611299 — a six-check JSON result.
Piano Sonata No. 11 in A Major, K. 331: III. Alla turca: Allegretto (arr. for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8fb349d52fe9bf7ef31a8059a6ed3ebf1398217a25535aaae39dd0a0ed3ed89. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USB8U1611300 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b4083b1491cdb7a3f0ec64c6e6721fe917271889819423909f08a7f95d07e7a. 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/USB8U1611304 — a six-check JSON result.
The Four Seasons, Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": The 4 Seasons: Violin Concerto in E Major, Op. 8, No. 1, RV 269, "La primavera" (Spring): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc553641ae9b3ea161cd2925dc186699d306448901499c805b3e57c85566c7840. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1611308 — a six-check JSON result.
Also sprach Zarathustra, Op. 30, TrV 176: I. Also sprach Zarathustra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3fec39ae1d5009cb7e488b6e4cd8a46824fe363e1e86008999ad856cf3e9d96. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USB8U1611309 — a six-check JSON result.
Peer Gynt Suite No. 1, Op. 46: IV. I Dovregubbens hall (In the Hall of the Mountain King)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc709e1ae76ad711afe7cbcc5a2588bd6be59209f2dec039f37434ca676a3e53. Chain 2 (Bitcoin): anchored in block 960276 (2026-07-30T16:01:17Z), 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/USB8U1611311 — a six-check JSON result.
Piano Sonata No. 14 in C-Sharp Minor, Op. 27, No. 2, "Moonlight": I. Adagio sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6d1bb2a3a9d8ef43ade57485403ca119da4793bcc5fcd1f8b7e72f35b6878b2. 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/USB8U1611314 — a six-check JSON result.
Liebestraume, S541/R211: No. 3. Nocturne in A-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad7f06fabd04911d25293eb629c1e75fd401e4c0a004ac8548eb70f0e7458d9. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USB8U1611315 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630ca71269ce99c0521393ab0876f42c0a2dc82113c9e9de385d9cf0a12f5716. 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/USB8U1611320 — a six-check JSON result.
Thaïs: Thais, Act II: Meditation (version for violin and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2900e20644aca9f861fb659b8dbb726ee2738dccf9f139b7170fa1f462dd345e. 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/USB8U1611329 — a six-check JSON result.
Suite for Jazz Orchestra No. 2: Jazz Suite No. 2: VI. Waltz No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b4e2f21feb0b9223e895cd8b6f39f322d8c1c796589f8e35f5cade6f12e977d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1611331 — a six-check JSON result.
Serenade for Strings in E Major, Op. 22: II. Tempo di Valse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251043f18220a915481095f55b53eb13b868dd2657ba23c3047b91f17cc4287b. 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/USB8U1611338 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe316dd1066de7a7fb52ee7952939ad1f94b27063e8e8162600d31f83bdd96b53. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USB8U1611339 — a six-check JSON result.
Overture (Suite) No. 3 in D Major, BWV 1068: II. Air, "Air on a G String"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf955f22e6ebc8f9db4ae8b99b0d606c7aa348ab6f60823a0ef7aa7031cf9f393. 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/DEAD60901011 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c798131aee96e367f3a27b1eed5461ef6eec1c7029da320aa58923480f29bb6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/DEAD60901035 — a six-check JSON result.
Melody (From "The High Pass) [Version for Strings]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x113356b2ff4b07966cd36eef828bbfaf32b20c183ad8fe8b2d0b390c738d72a5. 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/USB8U1700928 — a six-check JSON result.