K13 or K-13 may refer to: K-13 (film), a 2019 Indian Tamil psychological mystery thriller K-13 (Kansas highway) K-13 (missile), a Soviet air-to-air missile K13 gas fields, in the North Sea , a s
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 0x0cfd935a858cb39e570631eae624ca9a614a7028f7d2d1320be8d87e6c92d588. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39e592ca-176e-457d-a11f-e07e068c72e6.json and https://artists.proofprofile.net/proofs/artist/39e592ca-176e-457d-a11f-e07e068c72e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).