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 0x3bab3e4b2de8f15bce4c46ee438f46516be6361bf7d1eaaec600899917708448. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/216762f1-e10b-4b97-9a8c-1c1363b8e49e.json and https://artists.proofprofile.net/proofs/artist/216762f1-e10b-4b97-9a8c-1c1363b8e49e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xf9edd46090406ea0415161ab554c3c74baaa88aa012a032ef77f57c54384f6d3. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN961501280.
Patterns in Motion: The Great Minimalists
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9edd46090406ea0415161ab554c3c74baaa88aa012a032ef77f57c54384f6d3. 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/DEN961501280.
Concerto for 2 Violins in A Major, Op. 3/5, RV 519 (L'estro armonico No. 5): II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25407509935feb60a0c9deb0003e35b06aa9ab55e13d040f0a4a4708aab16ed. 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/DEN962431416.
Concerto for 2 Violins in A Major, Op. 3/5, RV 519 (L'estro armonico No. 5): I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e5b6e7217c9b1dde13a97bdc9dbe21c4b900a3f1446d409bdd21e04b6ec93a. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DEN962431415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf25407509935feb60a0c9deb0003e35b06aa9ab55e13d040f0a4a4708aab16ed. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEN962431416.
Concerto for 2 Violins in A Major, Op. 3/5, RV 519 (L'estro armonico No. 5): III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c76a6153ca6b08ea8728ad19974b41b51ffed4b0d78051adc3914e017f14ca0. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/DEN962431417.
Concerto for Two Violins and Strings in A Minor, RV 522: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc121d8650ad03499bf878956a8bdc0d50aa3bb891fe39b293a9e2506b0b6b975. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/DEN961501291.
Concerto for Two Violins and Strings in A Minor, RV 522: II. Larghetto e spiritoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29cf7efa3358813563e898492d984aff85c19877f3a706cb434c4c233829645. 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/DEN961501292.
Concerto for Two Violins and Strings in A Minor, RV 522: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd94d2601274546de50d32916fcd614b9ad789949b9e05cef8fb7a5bec6c0db. 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/DEN961501293.