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 0x063e156ab36c33b6d7d16eab703b2a6b0c8e66e25d566856d01c885d7ae863cf. 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/a79579e5-8565-441c-aa37-20b9026838c9.json and https://artists.proofprofile.net/proofs/artist/a79579e5-8565-441c-aa37-20b9026838c9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Roman Maciejewski: Requiem. Missa Pro Defunctis
11th International Fryderyk Chopin Piano Competition (1985)
Piano Concerto No. 1 in E minor, Op. 11: III. Rondo: Vivace
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 0x60d591e35b3633b77e819025b740d5679de7664684d423bf8a7c9185fa89d448. 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/USB8U1009979 — a six-check JSON result.
24 Preludes, Op. 28: Prelude No. 15 in D-Flat Major, Op. 28, No. 15, "Raindrop"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a91cc83256df17dbb8ad6e970870e1e5a5790dbbf02a487dd5d232c65fcb27. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEB261000050 — a six-check JSON result.
24 Preludes, Op. 28: Prelude No. 18 in F Minor, Op. 28, No. 18
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5c957565fa3503671ee39dde8aac274d7f1ec36717e1b44ef476188d853a3d. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEB261000053 — a six-check JSON result.
Scharwenka: Piano Concertos Nos. 2 & 3 (Hyperion Romantic Piano Concerto 33)
Scharwenka: Piano Concerto No. 2 & No. 3
The Pianist (Original Motion Picture Soundtrack)
Nocturne, B. 49: Lento con gran espressione in C-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a5e6ef011e466a863b64c3e36b2575045f92a5055bc0f376cacf9e2f954c4f. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USSM10209788 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fb0c80233c3b47c56e86118c6c2ecf00c10552e96d808cc55fa2d8b84ec94b. 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/USLIC0600303 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b97848183efc1c29c548ee4ff9618146ca9c4af7a049dd6cde45aa009da73b1. 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/USLIC0600304 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcff20d52223d9df35cc74047e4f8e9ec6b421804f6fccd95a9507b2068ccad. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLIC0600305 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff7b49e48886ea8705732cb643d43759f03557f1e8f30f541f8edb549ce6227. 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/USSM10209789 — a six-check JSON result.
Waltz in A Minor, Op. 34 No. 2 "Valse brillante"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8d6d7f55dfe6b39f3fe64cf2e9db6301247c61ec37b53c39343fc028fd409c. 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/USJSJ1012215 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc627c3084f5fec87209fc3d4d9e47bcf69e39beba5ce0446fbfd3d382d14089a. 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/USLIC0600307 — a six-check JSON result.
Andante spianato et Grande polonaise brillante, Op. 22: Andante spianato in G Major. Tranquillo
The Warsaw Philharmonic National Orchestra of Poland
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5cccfc02d527eb2915b951e3f74699773ef0bcf65518593b6fe061ceca0f61. 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/USSM10209791 — a six-check JSON result.
Andante spianato et Grande polonaise brillante, Op. 22: Grande Polonaise in E-flat Major. Molto allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e99dbed839a177f8f68371e46b628ab4478c231018925c9666a49e300fdbd44. 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/USSM10209792 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf717117d82cb84282d38803887506d7238b2a947626b7458e7bb5f78170102d6. 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/USSM10209793 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf499fed2f0d8801cd89635fcda193a934b59ac057db621cd97dbbe2b8334ccd. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USLIC0600308 — a six-check JSON result.
200 Greatest Classical Music Favourites: The Essential Classics
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f11324aa1cba2dbfa089d09229d437cbc6d3d56a0bab41124ba42b80d9f2dc. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USRDG0510133 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba552b14879b488a3451bdb2ad363fcb03912226be6e691275ed3885580d3e95. 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/USRDG0510123 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x237b5838bff543218d0704e1ea87ea76df2a2cba8de07c26f0522dae2bf4bdfc. 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/USRDG0910161 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f329c72271bac2ba407e990e9b01ed3a826a59c0a745d8b4c8f64bf6a37369c. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/USRDG0510120 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087a357f9f337720d1f0e1d21270300d117a0597da7f68c8a4a89fec7fe1d365. 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/USRDG0610473 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f328055982ec0ac25d0e20285661c32b258324f2c583e9cf283c81d3d15e2b6. 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/USRDG0510134 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b367b124222d91fc78735075f82aef434aba852586f1e9c06e964a087da2e17. 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/USRDG0610471 — a six-check JSON result.
Ode To Joy (From Symphony No. 9 in D Minor, Op. 125, "Choral") (Featured in "Dead Poets Society")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e1ac1ffffe78b4cf80e2b3e851e84606f711daba8c67805b03818765809e26. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/USRDG0310140 — a six-check JSON result.
Nisi Dominus In G Minor, RV 608: IV. Cum Dederit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8628ba8a9705d169230cb4439fb52847e1e7bbdab9f708e91470855e69531464. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USRDG0112380 — a six-check JSON result.
Favorites From The Classics Volume 11: Vivaldi's Greatest Hits