Tag, TAG, or tagging may refer to: Identification and tracking Tag (graffiti), a form of graffiti signature Dog tag, an ID tag worn by military personnel Ear tag, an ID tag worn by farm animals
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 0xf73ff05f510ef8e6c1db0cb04ec17ec9e645ab3c4ad666b5f6cf1d594ff79000. Chain 2 (Bitcoin): anchored in block 953985 (2026-06-16T18:03:53Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2df367d3-5796-4057-abe6-0948a31297f0.json and https://artists.proofprofile.net/proofs/artist/2df367d3-5796-4057-abe6-0948a31297f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).