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 0x12feb756127543fc45d2d59d3d2fe44e4b2be8d9cb885de9fd8e59bf961577b6. Chain 2 (Bitcoin): anchored in block 953730 (2026-06-15T02:47:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/937f5934-9f5b-4213-a095-d5dee713f727.json and https://artists.proofprofile.net/proofs/artist/937f5934-9f5b-4213-a095-d5dee713f727.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
4 Impromptus, Op. 90, D. 899: Impromptu No. 3 in G-flat Major
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 0x218f7044d6edd429d439aac1b736be6e9d7b392049648526dd67e47ef589f6fa. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/HKI199300603 — a six-check JSON result.
Wiegenlied, Op. 98, No. 2, D. 498 (arr. for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7326ef74d582a793ad69b79efad20423c3f803b564f9e50be7d4380f688cad4. 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/HKI199827010 — a six-check JSON result.
6 Moments Musicaux, Op. 94, D. 780: No. 2 in A-flat Major: Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff154a49a90635fb1a0faef0053c1dd8ab2680afee08e08bc633848c5103ff2a. 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/HKI199300802 — a six-check JSON result.
Symphony No. 6 in C Major, D. 589: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90160de0c1af8c9598d4af6459910907115618eea0e3a207e79d0c5120452736. 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/HKI199302606 — a six-check JSON result.
5 Stücke im Volkston (5 Pieces in Folk Style), Op. 102 (version for cello and piano): No. 2. Langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda852ec598d2e5a22a418dbb54f82ae2d23c09c6f153af3665899ad4c8c9b9dd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199300405 — a six-check JSON result.
Piano Quintet In A Major, Op. 114, D. 667, "die Forelle" (The Trout): Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd50e854a062fac85baa06dbe468b8e868ad0b231539d9ae8f31dfed5c54038. 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/HKI199300302 — a six-check JSON result.
Symphony No. 8 in B Minor, D. 759, "unfinished": Ii. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e896aa0909915ddeeeb2edb3f7f19a45dfe333e4d70d1a2124d362f3c566879. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/HKI199302702 — a six-check JSON result.
Piano Trio No. 2 in E-flat Major, Op. 100, D. 929: Ii. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4877c53a22b809b9ad48eb4a3f3dcb9779f0c172e1e1625d5fc267a7ca70036d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKI199301802 — a six-check JSON result.
6 Moments Musicaux, Op. 94, D. 780: No. 6 in A-flat Major: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75f7880edccf41a29e97ad9ee4ba775cfdb88792028719df49591ac6bd83e01. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKI199300806 — a six-check JSON result.
Adagio and Allegro, Op. 70 (version for cello and piano): Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05caf1d67c9f7c0648905b4321e65aec73f5fba4f6af0dca3460e4f384425e4f. 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/HKI199300409 — a six-check JSON result.
Piano Sonata No. 3 in E Major, D. 459: Piano Sonata No. 3 in E Major, D. 459
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0edcdaeab5a60a7001da690fcde2ed051435c11d197059f47edcf52322277f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190539207 — a six-check JSON result.
Beethoven: Symphony No. 4 & Piano Concerto No. 4 (Resound Collection, Vol. 7)
Piano Concerto No. 4 in G Major, Op. 58: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8198837ab23df3e3ee35106f44b4a1135f8e9f35ea32c00e45bd2b2fb82d67a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR50X1847801 — a six-check JSON result.
Beethoven: Symphony No. 8 & Concerto for Piano after the Violin Concerto (Resound Collection, Vol. 6)
Symphony No. 8 in F Major, Op. 93: I. Allegro vivace e con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54f7563949f5a8dab220628e65da963eabf4537c286204a2f215e8717a77a96d. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/FR50X1747701 — a six-check JSON result.
Symphony No. 8 in F Major, Op. 93: II. Allegretto scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6858093c1dd03720fb2287da79157dfbba286620bc9e9d03113469c615703df2. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR50X1747702 — a six-check JSON result.
Symphony No. 8 in F Major, Op. 93: III. Tempo di Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x763d21645affa13a445b24d35f9143bfd16ec45073193d658d7208194f00954c. 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/FR50X1747703 — a six-check JSON result.
Symphony No. 8 in F Major, Op. 93: IV. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d3c7d1ce74e7b66dfc6f52205ff9d9ec7a7c1917bc4993f127d0b1c8024e54. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/FR50X1747704 — a six-check JSON result.
20th Century Foxtrots, Vol. 4: France & Belgium
Une revue: Los Enamorados (Arr. for Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e12392e76e3b59d0045f558c00c08dafaf0a44e5fc9f3d5994c64958bb625c2. 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/HKI192200112 — a six-check JSON result.