Porter may refer to: Companies Porter Airlines, Canadian airline based in Toronto Porter Chemical Company, a defunct U.S. toy manufacturer of chemistry sets Porter Motor Company, defunct U.S. car
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 0x8f11527dd7389a8e3648fbc56b5e4f3d6927a43d2deae90448237b39357cd473. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79e67259-cb0b-433e-87e9-4e1f3b81eae3.json and https://artists.proofprofile.net/proofs/artist/79e67259-cb0b-433e-87e9-4e1f3b81eae3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).