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 0xe5624caafe0ffc7e2e216aff2f284a34817fb59c4760770050149d658ea93fb3. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43b7fb06-95d5-4d08-8c57-95a9c869b9ec.json and https://artists.proofprofile.net/proofs/artist/43b7fb06-95d5-4d08-8c57-95a9c869b9ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brahms: Double Concerto, Op. 102 & Horn Trio, Op. 40
Brahms: Horn Trio in E-Flat Major, Op. 40: IV. Finale. Allegro con brio
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 0xf591111c59cfb7d32af2aab55f4ddbf92d058fa2b894bfcbe32e320e5442257b. 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/DEA349601327.
Brahms: Double Concerto for Violin and Cello in A Minor, Op. 102: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3319b94a623a5f34d11ee976a36693316916a6949bcb40fee57dddc2f2175cb4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA349601321.
Brahms: Double Concerto for Violin and Cello in A Minor, Op. 102: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b5565946e3d462d9567525e1d27265e2f3238a40f45b1581582f258b79e3f4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA349601322.
Brahms: Double Concerto for Violin and Cello in A Minor, Op. 102: III. Vivace non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61c63d8a0370684ac97bddcc6b4ef4774e8ec9a4088bf0a74444ea3739522e6a. 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/DEA349601323.
Winds & Strings: Spohr, Ibert, Janacek & Widmann (Live)
Dvořák: Serenade in D Minor, B. 77; String Quartet No. 13 in G Major, B. 192 (Live Recordings from Spannungen Festival 2008)
Serenade in D Minor, B. 77: I. Moderato, quasi marcia - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f8dd305cab6f618ab7c820a2ff337915263e06177eded20b564b990f22b503. 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/DEAQ70900175.
Serenade in D Minor, B. 77: II. Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13f0a54f2858e5246bea81a6b4b1effe9bfad10f88a4d5a02e8142ec4722a4f. 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/DEAQ70900176.
Serenade in D Minor, B. 77: III. Andante con moto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb202fb4828929f3ba79b06f6ffd894c0eead31fbcb381527774b1357ecdc5d5e. 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/DEAQ70900177.
Serenade in D Minor, B. 77: IV. Finale. Allegro molto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x219e6af1be2d2d48a5356402ab243a1697fd003892fde5c5dbed66e8585d79c0. 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/DEAQ70900178.
String Quartet No. 13 in G Major, B. 192: I. Allegro moderato - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31e6aa64bfcc8a5429264874e1c8de10cc29f48a3988c7597a3f29f9c1837237. 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/DEAQ70900179.