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 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, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
50 Classical Favourites from Films, Vol. 11
Szymanowski: King Roger / Prince Potemkin
Stanisław Moniuszko - Songs / Arias / Overtures. The Best 20th-Century Recordings
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 0x15901ab8ee6d10ce3716534ef40508ac0b002d74df75de74bfe2cb65d737672f. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/PLZ041900115.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PLZ041900103.
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
Flis: Uwertura i Chór (Pędzą chmury, zcichły grzmoty)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5aec49295c137c8d5b14d07117739df5d9425a869b5cd8a1038e8a3ed15f4dc. 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/PLZ041900084.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB208703201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301be21d9a91e94d23536a46f772326c5701d08059790d606d9a9776e5446466. 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/DEB208703207.
Leopold Stokowski in Poland (From the Polish Radio Archives)
Szymanowski: Stabat Mater / Veni Creator / Litania
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)