Sangwan is a surname of the Jat people found in the Indian states of Haryana, Rajasthan and Uttar Pradesh. Notable people with the name include: Kishan Singh Sangwan (born 1948), Indian politician,
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 0x4cf03b131900dbe2581571852f2880097a8ab2423e2d412b21a150878eddb216. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/494383c3-2cab-473c-9dd7-326527394486.json and https://artists.proofprofile.net/proofs/artist/494383c3-2cab-473c-9dd7-326527394486.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.