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 0xb4bad295f605f09fdbf8fc479fcefd2458c4d40ee558dc33a8921074a4647f70. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e5148889-f4a5-4387-ad68-884911d0bb13.json and https://artists.proofprofile.net/proofs/artist/e5148889-f4a5-4387-ad68-884911d0bb13.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Symphony No. 36 in C Major, K. 425 "Linz": II. Andante
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 0x8a716cf5b63fc2acc60528a4c08d635c721ef7ac49d4f7c2f26d1af089b1ab6b. 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/NLY331410249.
Symphony No. 38 in D Major, K. 504 "Prague": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ebb3519f24f77dfe9e41371c24cc675c7283684124bca35585b05133c395819. 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/NLY331410258.
Symphony No. 41 in C Major, K. 551 "Jupiter": IV. Molto allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5548b351f7b3a32b78cff83fade703c78ab7d2108f64cecee1bc35daf8fc57. 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/NLY331410270.
Piano Concerto No. 9 in E-Flat Major, K. 271 "Jeunehomme": III. Rondeau. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9187ac61609c5d629580912f3e5badfbf974c6c67414f22d63532d61fe452f3a. 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/NLY331410314.
Piano Concerto No. 17 in G Major, K. 453: III. Allegretto - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde187b9a5cf4c081e83e1fb31b403553c707526636259ce2842ffa2a3e4f1db7. 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/NLY331410323.
Clarinet Concerto in A Major, K. 622: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277e392a3f7ffeb7c2ff377252aa8d2bc320cf5bbe938d3971c3c0915c3fad12. 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/NLY331410369.
Concerto in C Major for Flute and Harp, K. 299: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02e35c90253837b9707e4609f1dfaef607fa9ed416f8d4384b4debaf0c884bd. 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/NLY331410371.
Andante for Flute and Orchestra in C Major, K. 315
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485ec56d46116d9bd0f140c06412d4b6432d72b09a44a2cee2ff05d67010cdf6. 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/NLY331410380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaede7e85ac11efc4c8bcb92e50142a11b65a3c2b5030002762b7e1c4b7754a37. 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/NLY331602499.
Violin Concerto No. 5 in A Major, K. 219: I. Allegro aperto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3862bd739aa36c216bb70a0e76276314571433647b4a78552fc149fdf2099e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NLY331602506.
Divertimento in D Major, K. 136: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf621e5edeb81ef246b7349918dab5cb04a5d9d0e1e90a86396579b95e320817a. 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/NLY331410429.
Serenade in E-Flat Major, K. 375: V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdb838240cd462cddb03f9aeb749b6105114e4dcbe8c42e71947d82fb9b22dd. 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/NLY331410614.
Piano Sonata No. 16 in C Major, K. 545: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3305176848d0cd290565ddca1b0b19a7cd2cd836d29f2635c109868ca339a283. 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/NLY331411250.
Requiem in D Minor, K. 626: VIII. Lacrimosa
Südwestdeutsches Kammerorchester Pforzheim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143af41e3cdd004c0963a0a0a449ddb41639251291754d5ed4b89b4daca05c8c. 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/NLY331411359.
Clarinet Quintet in A Major, K. 581: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7e5c880dcd56cd45fc71e8c9db917e60d9266d6ed401afa2478690dad75250. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NLY331410889.
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
Peaceful Clarinet: The Romantic Collection
Meditations for All Seasons: Music for Spring, Summer, Autumn and Winter
Schubert: String Quartet No. 15 in G Major, Op. 161, D. 887
Schubert: The Late Chamber Music for Strings
Brahms: String Quintet, Op. 111 - Bruckner: String Quintet
Schulhoff, Weill & Hindemith: String Quartets
Schubert: String Quintet in C Major, D. 956
Mendelssohn: Octet, Op.20 / Bruch: Septet
Octet In E Flat, Op. 20, MWV R20: 1. Allegro moderato, ma con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e256497e596b1cead830868e0a3c7098dedddeadead47e544c62d7919205e6. 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/DEF058102661.
Octet In E Flat, Op. 20, MWV R20: 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b22bc6c346b10f12cc41248b0b323e8a69bc4dc3be9e39e3f243d879cb9f76. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058102662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x150a8e3c6f62ec5324130dc9ac15eb8140bea231c8fef75f300cca4df11e9d39. 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/DEF058102672.
Septett Es-dur op.post.: 3. Scherzo. Allegro - Trio. Un poce meno Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37cb3ef72de3ae41c4367fa3133df0dba8970f0ed9e1a81cba8283d200eb553. 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/DEF058102673.
Septett Es-dur op.post.: 4. Largo - Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac81c1afca992e2cb629a748bda3dde5d1bb0ba4966311da392d5e9dadf6eb1f. 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/DEF058102674.
Octet In E Flat, Op. 20, MWV R20: 3. Scherzo (Allegro leggierissimo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc776ed94964f1cba11cfa1d7d2114902c0dd38fe9e0fe9695c70f49878f1a2. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DEF058102663.
Octet In E Flat, Op. 20, MWV R20: 4. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5e0c63944f4b2670f033971df8552f849f48cec1d5ab3b5c815c35480dd02e5. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058102664.
Symphony No. 3 in A Minor, Op. 56, MWV N 18, "Scottish": II. Vivace non troppo - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc281a3ebe2e6c5b11fc723faafd2db21ca20f846884107cf3b60687fd6fdbc5b. 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/DEN961600892.
Symphony No. 4 in A Major, Op. 90, MWV N 16, "Italian": I. Allegro vivace - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58bd54cb00745747bf4880635ed8cd931032215cedf90b2414c807336e05c958. 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/DEN961600901.