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 0x6570c36c9916741eebbc8dc54f569a1d4e5e80fb4eefad609c91507c1ea7d202. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69c2ea4f-65f2-4958-94b8-c3e4f0a729c2.json and https://artists.proofprofile.net/proofs/artist/69c2ea4f-65f2-4958-94b8-c3e4f0a729c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tchaikovsky: Complete Works For String Quartet. Vol. 1
Tchaikovsky: Complete Works For String Quartet. Vol. 2
Moscow String Quartet & Gary Graffman - Shostakovich, Schnittke
Moscow String Quartet: Borodin, Stravinsky, Tchaikovsky
Webern - Nono - Gubaidulina: Musica da Camera
String Quartet No. 1 in A Major: I. Moderato
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 0x2ef132aee9850a9f44a9f002ba6bb527be17155fa8575b0a67380cf8025cdbe7. 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/NLY330905076.
String Quartet No. 1 in A Major: II. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e3a2580fae61243232c529a649cb8ed0b59985723923bf0cd7d9653e2ea99f. 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/NLY330905077.
String Quartet No. 1 in A Major: III. Scherzo. Prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b79aca2467aff4a9b0e90c55da64bdc06d839ef83a77be103d31b3ec000a73f. 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/NLY330905078.
String Quartet No. 1 in A Major: IV. Finale. Andante - Allegro risoluto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd97fc437dc93a965e23862dee6a03577eb851f1ff63702cba17994613ec1e833. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLY330905079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679fc0d830db02e722c2f111ce0a8f1593f27c64454951cd0035cbc3ddedabff. 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/NLY330905080.
String Quartet No. 2 in D Major: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48262c794feea89bc5cacc8bf806741a88583c6483c1392b6fe019d099c6490d. 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/NLY330905083.
String Quartet No. 2 in D Major: II. Scherzo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417f4cbbe5c84475d42ab9db094e555323ecf0c1843326381f3383a621738649. 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/NLY330905084.
String Quartet No. 2 in D Major: III. Nocturne. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5383a64e9192fd4592d77e46f8f283a6fcd51d80c53d692be7051aaa803c802. 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/NLY330905085.
String Quintet in F Minor: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1fc554aefd93ef2be6b1e3110add47da0dc4b464f68ba6b9d79705571658b5. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLY330905087.