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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90830f9939d7ebd0859afb2a36b72b632cfd84f1f1af89601dbff7620748357b. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/306ea0d5-27af-4b5e-bea5-8c4218f26c52.json and https://artists.proofprofile.net/proofs/artist/306ea0d5-27af-4b5e-bea5-8c4218f26c52.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).