Isko or ISKO may refer to: People Isko Moreno (born 1974), Filipino politician and actor Isko Salvador (born 1958), Filipino actor, comedian and comedy scriptwriter Organizations International So
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 0x4611cf5be9d8f2517cec6b7af31318b4ce640a44c6ccc8de9686f6fa891c7713. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/536ae10b-e1f4-45d1-bfd0-abfbc9c9405e.json and https://artists.proofprofile.net/proofs/artist/536ae10b-e1f4-45d1-bfd0-abfbc9c9405e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).