A spearhead is the sharpened point (head) of a spear, similar to an arrowhead. It is often a separate piece called a projectile point. Spearhead may also refer to: Armed conflict Armoured spearhe
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 0xca4dba307cb7f90f34a892a4c61e1126020b6a13e5f53a39d4150e36fb3fe1ca. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06792857-f81d-4772-9226-3942e71e4efb.json and https://artists.proofprofile.net/proofs/artist/06792857-f81d-4772-9226-3942e71e4efb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).