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 0x4d35bb8af9c04c610181914d5536a7da234abb8c3acb146fc22a794eedd4ba0b. Chain 2 (Bitcoin): anchored in block 953687 (2026-06-14T20:19:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/693365e0-7135-414c-95a4-231feacf3686.json and https://artists.proofprofile.net/proofs/artist/693365e0-7135-414c-95a4-231feacf3686.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Trio in G Minor, Op. 17: I. Allegro moderato
Clara, Robert, Johannes: Atmosphere and Mastery
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 0x59b1294538614a1c07512267b88bf6493e48745c55815cbfa3f922ac7756ec6b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CALC42200805.
Piano Trio in G Minor, Op. 17: II. Scherzo - Tempo di Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfedc4320b3da7999dda768e3aa7439c59fbd5e930838f15b545123489ef547. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/CALC42200806.
Piano Trio in G Minor, Op. 17: III. Andante più animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b315a54b935275f9fd7fb07e9c210f7dc59cdf7261483a039b1749f8c160ca9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CALC42200807.
Piano Trio in G Minor, Op. 17: IV. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dfaea398308082206596a94ddf8510680c711021e1754ae272a7c73aa4f2b4. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CALC42200808.
Three Romances for Violin and Piano, Op. 22: No. 1, Andante molto
Clara, Robert, Johannes: Romance and Counterpoint
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed642174d60413e144a8dd400406737c04b4fd9cedd0cf7bc72ef76caa89a41. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CALC42302405.
Three Romances for Violin and Piano, Op. 22: No. 2, Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbda350e5339adce7e1db63728cb67959f54666949927f682ac762fa46e603cd. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/CALC42302406.
Three Romances for Violin and Piano, Op. 22: No. 3, Leidenschaftlich schnell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff31420fec8853a03b14e6739bddc8e6d06d2042a46aa9c10bb02fdba176196b. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/CALC42302407.
Concerto for Two Violins in D Minor, BWV 1043: I. Vivace
J. S. Bach: The Complete Violin Concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x691ab080e1bc98877d7d5b52dccf99d2290797903d1ebf26eef50a2e4688d653. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/CALC42589404.
Concerto for Three Violins in D Major, BWV 1064R: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c088b3b20abac15252b4cf55cddf9dffc9c9cfce51a51b622f421f37f4519dc. 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/CALC42589411.