Kassin is a surname. Notable people with the surname include: Elmo Kassin (born 1969), Estonian cross-country skier Sam Kassin (born 1944), American educator Saul Kassin (born 1953), American psyc
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 0x30f82ea6bc8646c4ae8d02cfa5df3e29916542e9ce3d7d44415e4727792ba5a5. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16e5208a-7ee7-4dce-8168-ab63cbddd40b.json and https://artists.proofprofile.net/proofs/artist/16e5208a-7ee7-4dce-8168-ab63cbddd40b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).