Kosi may refer to: __NOTOC__ Places Kosi River in Nepal and Bihar, India Dudh Kosi River in Nepal, tributary of the Kosi Sun Kosi River in Nepal, tributary of the Kosi Bhote Kosi River in Nepal, t
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 0x775b10ef0438a9d56d557ef8ea3bf8b4e1b4f4a06652a9bcfaa79d84c26dec85. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8e0cc53a-a0c2-41e8-81ef-e5284dd3d87f.json and https://artists.proofprofile.net/proofs/artist/8e0cc53a-a0c2-41e8-81ef-e5284dd3d87f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).