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 0xc45c365983b0c12304ad4f352ee2897ec23d688803b397aaa1114096a5ac7ce0. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a6ffe79-987a-4c70-a24c-01123876d82d.json and https://artists.proofprofile.net/proofs/artist/9a6ffe79-987a-4c70-a24c-01123876d82d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
50 Classical Favourites from Films, Vol. 11
Piano Concerto No. 2 in F Major, Op. 102: I. Allegro
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 0x5f4155f89f10b1f1fcd9fa73801ceab238e5a553ac35215196b665d6cb190060. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBLGL1213951 — a six-check JSON result.
Szymanowski: King Roger / Prince Potemkin
Stanisław Moniuszko - Songs / Arias / Overtures. The Best 20th-Century Recordings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47e9592f0f5fcbc633ffaa212d2e0d1e455fc00ff21f28bb43e6aa216b615a5a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLZ041900117 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60261b07d53532326b9847712b9c2c0b3e172fdb049fc9bfdc0111d1b23e1b63. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/PLZ041900103 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15901ab8ee6d10ce3716534ef40508ac0b002d74df75de74bfe2cb65d737672f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLZ041900115 — a six-check JSON result.
Flis: Uwertura i Chór (Pędzą chmury, zcichły grzmoty)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5aec49295c137c8d5b14d07117739df5d9425a869b5cd8a1038e8a3ed15f4dc. 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/PLZ041900084 — a six-check JSON result.
Solisten der Staatsoper Warschau (Stereo Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea1d28ebc152e5681f0119c3b1f7d5d79d1276e04fb6cc7c011d57f7b16ee07. 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/DEB208703201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b13603de4097bc938048319eaf5db4ab0aee4fe10fedb4b4be6856531dda6f4. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEB208703202 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301be21d9a91e94d23536a46f772326c5701d08059790d606d9a9776e5446466. 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/DEB208703207 — a six-check JSON result.
Leopold Stokowski in Poland (From the Polish Radio Archives)
Symphony No. 1: III. Allegretto misterioso
Orkiestra Symfoniczna Filharmonii Narodowej
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8080b836048b3f2ec0fdb1e948b570727b9b1d0023b54d3c52dc380cbb1bbc9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PLA392100093 — a six-check JSON result.
Szymanowski: Stabat Mater / Veni Creator / Litania
Stabat Mater, Op. 53: I. Stabat mater dolorosa / Stala matka bolejaca: Andante mesto
Polish State Philharmonic Chorus (Katowice)
Polish State Philharmonic Orchestra, Katowice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc377daccc4f44da1020dcb4b8fac7f2a09f5035e7c032829397c701e81ffe2e1. 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/HKI199315101 — a six-check JSON result.
Stabat Mater, Op. 53: II. Quis est homo qui non fleret / I ktoz widzac tak cierpiaca: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071ea3ad78602fbedf736e191212e4f0f6bb81b535f6d33f64bd1d37d012035b. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/HKI199315102 — a six-check JSON result.
Stabat Mater, Op. 53: III. Eia Mater, fons amoris / O Matka, zrodlo wszechmilosci: Lento dolcissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac7e4975561a7cd3663d34164652f006ff181351aadb9aac85c9558962dca423. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/HKI199315103 — a six-check JSON result.
Stabat Mater, Op. 53: VI. Christe, cum sit hinc exire / Chrystus niech mi bedzie grodem: Andante tranquillissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9c88256bb60f283d9656b7b7d116c2e7ededc1ba33270c12647fd558e73fc71. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKI199315106 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5085902a8a321fc88caa76f23d4a29ef29ff2fe90202c7a1a7327e9fec67ad4d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PLA160440203 — a six-check JSON result.
MONIUSZKO: STRASZNY DWÓR "LE CHÂTEAU MYSTÉRIEUX"
Szymanowski: Stabat Mater - Litania - Demeter
20th Century Classics - Karol Szymanowski
Karol Szymanowski - King Roger & Harnasie
Szymanowski: Stabat Mater & Symphonie No. 3 "Le chant de la nuit" (Mono Version)
Szymanowski: Stabat Mater, Op. 53 (Mono Version)