Canti del Sole (Songs of the Sun) is a song cycle written by the British-American composer Bernard Rands. The music exists in two arrangements: one for tenor and orchestra and the other for tenor and
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 0x8dde8785c9d094ce316d01e0990500a02ff0ecce6b4372e2ffd0ddc7c528465c. Chain 2 (Bitcoin): anchored in block 953954 (2026-06-16T14:18:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25e123ab-cf41-4dc9-966b-272136decd01.json and https://artists.proofprofile.net/proofs/artist/25e123ab-cf41-4dc9-966b-272136decd01.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).