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 0x4e04852f64a699240165ef9d68e6c340c24bb71f0f79a3887105b286521e9cd7. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/049bc90c-d920-4fa4-9611-63ff85e432b8.json and https://artists.proofprofile.net/proofs/artist/049bc90c-d920-4fa4-9611-63ff85e432b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): I. Allegro
Brahms, J.: Piano Quartet No. 1 (Orch. A. Schoenberg) / Clarinet Sonata No. 1
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 0xc5eacc4fc5202c8943ebeec688a47fde6b8210b5c0b354efa41dc518c110737a. 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/DEB200835601.
Clarinet Sonata No. 1 in F Minor, Op. 120 (orch. L. Berio): II. Andante un poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2775012c0ed93b8c31821548d9289dc25fb39178b722ab24642201ed2894da17. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEB200836206.
Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): II. Intermezzo: Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbe874defa57f281b36d001930d2490f2f966c2065cc9baa110ceb6f26fb7452. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200835602.
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
Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): III. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403755b9c8d4bc6546626958b700cbbb32d4a25db548d262e1acc5bfcc718c55. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DEB200835603.
Piano Quartet No. 1 in G Minor, Op. 25 (arr. A. Schoenberg): IV. Rondo alla Zingarese: Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e798e80af376993669c855bda97a62a8f7eb32b21992d4681a92b2c708fa004. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200835604.
Clarinet Sonata No. 1 in F Minor, Op. 120 (orch. L. Berio): III. Allegretto grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbebf8beb36162f06c1836c30e6ee53137bf0d4a7a52cd7d53d61892ba6484fed. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200836207.
Clarinet Sonata No. 1 in F Minor, Op. 120 (orch. L. Berio): IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a85db83a5e8c4d7feb0a9c5039cc56fc9d7046481696c83ee2d81c1628dbba. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB200836208.