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 0x11fbad2565ac23ea59a1b6af426d897d10165c001d82dfb6374c33fd3c71763c. 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/186599c7-8af3-4def-a257-4251762170d5.json and https://artists.proofprofile.net/proofs/artist/186599c7-8af3-4def-a257-4251762170d5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Rubinstein: Piano Concerto No. 4 in D Minor, Op. 70 & Caprice russe, Op. 102 (Live)
Piano Concerto in A Minor, Op. 7: I. Allegro maestoso
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 0x7da6db885ac30ddab735bb4d0e4c59bb0c28ce619a2d9f74941f21014598172b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400027 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ac10deceafdfdf326db7c965cbabacad6b635206ee9d829d6298059a194add. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400035 — a six-check JSON result.
Das Jahr, H. 385: I. January: A Dream. Adagio, quasi una Fantasia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9154bcbea61f821775d86f431d7f286fa2db8197c14ed793839c239850092a4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400006 — a six-check JSON result.
Das Jahr, H. 385: II. February: Scherzo. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c40a440edb99261d57b232cc3b3ec6918f5701dcbabe1086c6ea9218d56899b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400007 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986b4f17d5dbb1d9f59eee2b5597d16dd0933139c266b927b15ac4376aaba475. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400008 — a six-check JSON result.
Das Jahr, H. 385: IV. April: Capriccioso. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe68e83c6af05546e1b710dcbbb28c08818c11f6839a6a6ae60f4a28a27f1f6fe. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400009 — a six-check JSON result.
Das Jahr, H. 385: V. May: Spring Song. Allegro vivace e gioioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2286faecdc69ae8bde6f23e8bd7956646e8bd5acbda62c7f1b790ca88824ede3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400010 — a six-check JSON result.
Das Jahr, H. 385: VI. June: Serenade. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ef99d693a8b5efee85b8fa3f7f3ffc333f1fb3e3151bb9b6bcbf6b4ce8d726. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400011 — a six-check JSON result.
Das Jahr, H. 385: VII. July: Serenade. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e8e27a15421c902fba018e31b14acfa39b3982df099ed1c1f3af3a69ff455f. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400012 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ddb9795a0d42d6d89eb74ede8365bb875968b38c8aa0c69614348e0f84f90c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400013 — a six-check JSON result.
Das Jahr, H. 385: IX. September: At the River. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10fdeeaa1b75cfbf2376d90479255f7159571498086a4c761e64b04dc67beb60. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400014 — a six-check JSON result.
Das Jahr, H. 385: X. October: Allegro con spirituo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea657ab232f705de823a3c602a27d31342760b06912b31b5d16290cb8491382d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400015 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d4b83630cd6f7103274cf964fb1b9cabbd59dc62a1c90765a9d37f213cc82c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400016 — a six-check JSON result.
Das Jahr, H. 385: XII. December: Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2b99c395c0853e4bf968bf1b2fe32ec41f23f4d8185d41c117dda34efa9aa2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2400017 — a six-check JSON result.
Anton Rubinstein: Piano Concertos Nos. 1 & 2, Pièces caractéristiques, Op. 50
Piano Concerto No. 1 in E Minor, Op. 25: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c8861db38db1c2d398f9bbd39b811d742cc6ac60b6d2910059e98ddbc985989. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USA4A2300041 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d66e02ab4e031bb1adab70d218c7478f2398d79c5c9540830bd1cd3a069ce31. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1801100 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d587575289cddf82698b85e59b6052ebba9b2b2c60afd54a2cee01ca665679a. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1801102 — a six-check JSON result.