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 0xb73c52cd02281e9f0165e0d1b5765e18aa9437a6b7e7d8adbfa27b2407fbee53. Chain 2 (Bitcoin): anchored in block 953857 (2026-06-15T23:34:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/02d51d15-33a1-42d2-bd05-2c4c82879562.json and https://artists.proofprofile.net/proofs/artist/02d51d15-33a1-42d2-bd05-2c4c82879562.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
String Quartet No. 3 in F Major, Op. 73: I. Allegretto
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 0xb1002bef56ebed7a93ead7283fda860446593859c94492c5e95f8f2d64c40959. 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/NLY332103630.
String Quartet No. 8 in C Minor, Op. 110: III. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6120c0f850fd213994ef1a6d99bcfc935914eccde5b401a5b164168865d3543. 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/NLY332103643.
String Quartet No. 8 in C Minor, Op. 110: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8994125bf511802c105994ce4bd40c20d9e82dc299de98ccebba1d3790db49c7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLY332103641.
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
String Quartet No. 8 in C Minor, Op. 110: II. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec425866a68b0a6d9ef2461c0a644ddc63ec7f6febc5c0fd83e5d7809bd2c9b. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/NLY332103642.
Boccherini, Verdi, Puccini, Respighi: Works for String Quartet
Boccherini: String Quartet in D Major, Op. 8 No. 1, G. 165: I. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeea1f46a83004659af50eaab61b577a8751bb732652fefce6200264d35e02fd7. 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/ITH451800583.
Boccherini: String Quartet in D Major, Op. 8 No. 1, G. 165: III. Minuetto in rondò - Allegro grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x550d39d53bfed613e93a0a63c39d260e3de135e2e54cfcd2c49a044192d2845f. 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/ITH451800585.
Puccini: Crisantemi: Elegy for String Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f71f585bc02c7f0dfa8de1c4c60076476f47d9c49f8d5c5a224c0eb389fd6d. 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/ITH451800586.
Verdi: String Quartet in E Minor: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe60f3844b2b1d562dd4510a169dee31b7dc8d9e638cce6e871198fbf9e5870. 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/ITH451800587.
Verdi: String Quartet in E Minor: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65ae70b4a1c3cc5a913def45b16dacf2487cffccc89d549a1d6d38063bda3ec5. 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/ITH451800588.
Verdi: String Quartet in E Minor: IV. Scherzo fuga - Allegro assai mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87e076582a5c1062b01006eda85f3f26b7a2e55b6c5fe8e7487e6d371deb1a92. 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/ITH451800590.
Respighi: String Quartet in D Minor, P. 91: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3581d091d90824c8c12d6a07f916b500c953668f16f6c192af3e8dafc38f0a1f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ITH451800591.
Respighi: String Quartet in D Minor, P. 91: II. Lentamente con tristezza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b71115915fbea7302d7e35d515df7d20f647a790253d52c8473a3d518d4f59f. 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/ITH451800592.
Boccherini: String Quartet in D Major, Op. 8 No. 1, G. 165: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba611d525787aac2c9ad310f0231a0cb884fd634a42770889a33c9b39318b354. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/ITH451800584.
Verdi: String Quartet in E Minor: III. Prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6206c70c573d2ed3385b86126ba31587c1fcf5bb4419a19646c45dad3b6eb3b0. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/ITH451800589.
Stravinsky, Haydn, Debussy: Quartetto Noûs