Major Manna Singh (20 February 1914 – 22 July 1954) was an Indian field hockey player and officer in the British Indian Army. He was the coach of Indian field hockey team. History Manna Singh was bor
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 0x7910bea17657d10e786bc0f7e1120056edbd94ebef73b835f1b8ffb3f8bcb071. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cca320a8-b48f-4f82-ba0b-b628439398a5.json and https://artists.proofprofile.net/proofs/artist/cca320a8-b48f-4f82-ba0b-b628439398a5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.