7K or 7-K may refer to: 7000 (number) The year 7000, in the 7th millennium Gnome-Rhône 7K Soyuz 7K-L1 Soyuz 7K-L1 No.4L Soyuz 7K-L1 No.5L Soyuz 7K-L3 Soyuz 7K-OK Soyuz 7K-OKS Soyuz 7K-T Progress
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78278b13d1388164582190a6dfdde5711c20707e2d85f8a9dfa05127a7dea243. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e4ed28b-aefb-4dce-96f9-97c985e22b96.json and https://artists.proofprofile.net/proofs/artist/5e4ed28b-aefb-4dce-96f9-97c985e22b96.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).