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
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, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d591e35b3633b77e819025b740d5679de7664684d423bf8a7c9185fa89d448. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1009979.
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 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB261000053.
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 953536 (2026-06-13T17:25:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10209788.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLIC0600303.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLIC0600304.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLIC0600305.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10209789.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USJSJ1012215.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLIC0600307.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10209791.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10209792.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10209793.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USLIC0600308.
200 Greatest Classical Music Favourites: The Essential Classics
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USRDG0510123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x087a357f9f337720d1f0e1d21270300d117a0597da7f68c8a4a89fec7fe1d365. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USRDG0610473.
Favorites From The Classics Volume 11: Vivaldi's Greatest Hits