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 0xab3983915c65c01547cceb2253411ac24d7f3286e285d1dbaa827f1f3cb58937. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2eca3d8b-6f18-4dba-be93-e56cca3f1ddc.json and https://artists.proofprofile.net/proofs/artist/2eca3d8b-6f18-4dba-be93-e56cca3f1ddc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Lili Boulanger: Songs (Hyperion French Song Edition)
Korngold: The Complete Music for Violin and Piano
Tippett: Songs – For Tenor Voice with Piano or Guitar
Trio in A Minor, Op. 114 for Clarinet, Violoncello and Piano: III. Andantino grazioso
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 0xb6a143497ed961891eb7a3c79d30f0efdc1249cc1391b25af7f7bbcda9c78efd. 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/NLG620410286.
Quintet in B Minor, Op. 115 for Clarinet and String Quartet: III. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5680392a8fe100ecd4116ba9e8343e39f9c94a5448e809809ebe7631bb64eaf. 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/NLG620410289.
Trio in A Minor, Op. 114 for Clarinet, Violoncello and Piano: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d94ea60c1dc0f1dc76c2189452dd3458b5272a15475f11ae23e19730f7ab64. Chain 2 (Bitcoin): anchored in block 960303 (2026-07-30T20:11:13Z), 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/NLG620410284.
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
Trio in A Minor, Op. 114 for Clarinet, Violoncello and Piano: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ddab9b0120fc553063d2ab3e38ecd498bb23cf4304a9f9e62dffa420e71114. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLG620410285.
Quintet in B Minor, Op. 115 for Clarinet and String Quartet: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca4516ffee7db52d0d56237d391ad02b3d2d6685726e3b1577c52e760f62be39. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLG620410287.
Quintet in B Minor, Op. 115 for Clarinet and String Quartet: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830d3c9412d759298a155b9330a18a9279bd59028ee65ca63458dd965abf0864. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/NLG620410288.
Alwyn: Sonata Impromptu / Sonatina / Ballade / Rhapsody / 3 Winter Poems / Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff5747644311528e7864c5aa79316c5d4fbe9c714277f8a346546e264d205e25. 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/HKI190717012.
3 Winter Poems: No. 3. Serenade, "Snow Shower"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15b76097a6ac9af9670d37009316da1ac316b9127b94384ff13c183afb4f59f. 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/HKI190717016.
Wolpe: Music for Any Instruments - Ensemble Avance (Digitally Remastered)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee5f6e5d28d95e09ef4ac33d94e0437b4d6ba8c6b3519ed55ad74613d9445543. 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/AUMEV2555475.