thumb|Joaquim Homs Joaquim Homs i Oller (; 21 or 22 August 1906 – 9 September 2003) was a Spanish composer. Homs was born in Barcelona, and studied cello until 1922. Afterwards, he educated himself
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 0xca90a8e8f73090fdd63929c3113a0fdc18bc6674f2514e4a56d66c16f301b56b. 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/56f54089-9ad4-400a-abe5-19aa1ffb0910.json and https://artists.proofprofile.net/proofs/artist/56f54089-9ad4-400a-abe5-19aa1ffb0910.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Homs: Piano Sonata No. 1 / Remembrances / Three Envocations
Homs: Piano Sonata No. 2 / Presences / 9 Sketches
Joaquím Homs: Música de cámara con guitarra
Piano Suite "Entre dues línies" (Version for 2 Guitars): 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 0xa8f3632ce3dfbc65490684f7d5b4d6821b3e5b1d09c8e305f428fc17c81de221. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI191714301.