Tonka is an American brand and former manufacturer of toy trucks. The company was founded in 1946 and operated as an independent manufacturer of popular steel toy construction type trucks and machiner
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 0xccfb5eb1904fc4754d2ce6592985bd8bd86410bde66a7544e37c35d56cf3f461. Chain 2 (Bitcoin): anchored in block 953975 (2026-06-16T16:53:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2b327807-e1b5-4312-89f4-f77a7d6ce7be.json and https://artists.proofprofile.net/proofs/artist/2b327807-e1b5-4312-89f4-f77a7d6ce7be.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).