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 0xb86c492898aa7d9b3d836a1477dff9451063216e94c0cb7188bfb4626c0721f9. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db518dbe-d188-46c8-9538-01a0a9d9cc31.json and https://artists.proofprofile.net/proofs/artist/db518dbe-d188-46c8-9538-01a0a9d9cc31.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Castelnuovo-Tedesco, Ponce, Walton, Sierra
Clarice Assad, Brouwer & Others: Guitar Works
Guitar Sonata No. 1 in D Major: I. Allegro 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x811a9ed91d8a765e4d62419576874d4e9e723007adaf944f7cef73f721a36472. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI192200706.
Guitar Sonata No. 1 in D Major: III. Scherzo-Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d3fb9248c26a8f4856401794e842b6c4c3f8a7418224118993c430b2fa7055. 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/HKI192200708.
Keyboard Sonata No. 23 in D Minor: I. Adagio (Arr. R. Oliveira for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563907eb01bb5c3c2c35d236de6547935dfc5a308244d84adbfaaec2080dc79d. 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/HKI192200710.
Keyboard Sonata No. 24 in D Minor: II. Allegro (Arr. R. Oliveira for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x866ee11f02c3d359042d6dc9351346cd3359c9ac26d3d476d99bd4741667238a. 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/HKI192200711.