Thapa is a surname used by multiple ethnic groups, including the Magar and Chhetri (Kshatriya) communities. While the surname also exists among Rajput groups in northern India. The surname Thapa was
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 0xf5a423f74eef0f789ec1641be7d728f0225e6d7282283f0c331374a8d0c1607e. Chain 2 (Bitcoin): anchored in block 953959 (2026-06-16T14:51:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27bb0f6a-18bf-4481-a9a5-ee54a8dae880.json and https://artists.proofprofile.net/proofs/artist/27bb0f6a-18bf-4481-a9a5-ee54a8dae880.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).