Samar ( ) is the third largest island in the Philippines. It has a population of 1,924,651 as of the 2024 census. It is located in the Eastern Visayas region of the Visayas islands. Since 1965, the is
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 0x79d468815aab189124837d5a006ce8a8cc8c4b4b6b4aba67cb058f73c52eb1f2. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5f5f0ac-cfff-4fbf-923b-43996d27b64d.json and https://artists.proofprofile.net/proofs/artist/d5f5f0ac-cfff-4fbf-923b-43996d27b64d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).