Raymundo Cipriano Pujante Cayabyab (born May 4, 1954), known professionally as Ryan Cayabyab (), is a Filipino musician, composer and conductor of Original Pilipino Music (OPM). He was the Executive a
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 0xb7a50778a6c56131b655bbbee071427193349364f4997fb19c1d4b1d23dbf5c9. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d91088ee-d73d-4dfe-ae75-9d5766a3ab17.json and https://artists.proofprofile.net/proofs/artist/d91088ee-d73d-4dfe-ae75-9d5766a3ab17.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Florante at Laura (Original Filipino Ballet by Ryan Cayabyab)