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 0xffeba23599c46a71a5f816fd06980d3636b65e1aa59b7c3a5c2db32fceef6e14. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29906c60-66c7-4d05-8f9a-18af601153ea.json and https://artists.proofprofile.net/proofs/artist/29906c60-66c7-4d05-8f9a-18af601153ea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Horizons (Traditional Music from Around the World)
The Titan (Traditional Music from Around the World)
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 0x85b06ae0048e4eaa7217a452f6148d76470e13db4792c9ad09d4a10e8e10050a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/FR6V81579630.
Sinfonia in C Major, RV 116: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffe2d71f9ceb5a314ad03ce2fc5ce0e34e27ad66d1777e79868bf88acd808c8. 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/USFKZ0611003.
Trio Sonata in G Minor, Op. 1 No. 1, RV 73: IV. Capriccio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca21dd4757265035b8d24a7947f83a931f0b772639e2637aedf8f0bba48ab27. 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/USFKZ0611008.
Trio Sonata in G Minor, Op. 1 No. 1, RV 73: V. Gavotta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x511946586fb6050b2676c8dd486e1b7df0c017408b6aab15ff6e3d3c280019c0. 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/USFKZ0611009.
Concerto for 2 Violins in E-Flat Major, RV 515: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eaa6695804ef3a92d984283009104e1a42b96258d0805e56a0748523dd71d9a. 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/USFKZ0611010.
Trio Sonata in C Major, DürG 13 (Attrib. to J.S. Bach as BWV 1037): III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9eed1505ecdca9a606ef0c5058fde21744e7baa11ab0b296c20d759b78a3ac. 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/USFKZ0611016.
Trio Sonata in C Major, DürG 13 (Attrib. to J.S. Bach as BWV 1037): IV. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f59c082b46af8b13b9c8779f1b9d7848a25ece02975bb095606239a36b73828. 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/USFKZ0611017.
Sinfonia in C Major, RV 116: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b10c91cd9bc06783ff65d7195a60cc10d1860f65d5feb43d73afa792d0f4e24. 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/USFKZ0611002.
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
Sinfonia in C Major, RV 116: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b85bd90de423559cc59d96e46510e8b985756b7d3fc0cc6b12d26af5004912c. 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/USFKZ0611004.
Trio Sonata in G Minor, Op. 1 No. 1, RV 73: I. Preludio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a2e9a1d93f40cfd55fcbd9d2645731b02c6e0326bd9aa715d6a49198259db6. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USFKZ0611005.
Concerto for 2 Violins in E-Flat Major, RV 515: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08fd87c75e150619abfd1285348c79eaa24525fd6856284b0e30adf54d7a1df5. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USFKZ0611011.
Trio Sonata in C Major, DürG 13 (Attrib. to J.S. Bach as BWV 1037): I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb142612a8b231dc5ae71de12ed26d2155490ff6fb5ebe9447f11902d8b28e6f3. 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/USFKZ0611014.
Trio Sonata in C Major, DürG 13 (Attrib. to J.S. Bach as BWV 1037): II. Alla breve
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709ec4497be40bdaaa60fa55ff289df04dda4bba25d4172e13f13425aae40d87. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USFKZ0611015.
Concerto for 2 Violins in D Minor, BWV 1043: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf21f22d2d2aaf39b982b433271cbaf2b5c60615c57c7e6e8b801ff51f06083. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USFKZ0611018.
Concerto for 2 Violins in D Minor, BWV 1043: II. Largo ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7162a325d5b465088ba6f060a3f17e4ada9fa9ae209b27a0403f85b0cefecfb. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USFKZ0611019.