CryptoSlate
Google blocked 8.3 billion ads and suspended 24.9 million advertiser accounts in 2025, with 602 million of those ads tied to scams — numbers that illustrate how generative AI has made fake clicks, fake users, and fake devices cheap enough to overwhelm traditional detection. Even with Gemini analyzing hundreds of billions of signals in real time and catching over 99% of policy-violating ads before they run, the fraction that slips through still reaches one of the world's largest ad networks at scale.
Why it matters
Two distinct blockchain-based verification models are now moving from white papers to live campaigns. Hakuhodo, Japan's second-largest advertising agency, partnered with Tools for Humanity and LG Electronics to run a "Human-Verified Ad Network" pilot in Japan from July through August 2025. The test served ads exclusively to World ID-verified users, logged every impression to LG's blockchain infrastructure, and reported a 50% increase in click-through rates alongside a 15-point improvement in bounce rates across more than 3,500 participants and ten advertisers. Separately, Coinbase acquired Spindl in January 2025 to rebuild ad attribution on-chain, tracing a user journey from a web click all the way to a wallet interaction or token purchase on Base, Coinbase's Ethereum layer-2 network.
Market impact
The stakes are large. Dentsu puts global ad spend at $1.06 trillion in 2026, with US programmatic revenue alone reaching $162.4 billion in 2025. Juniper Research projects ad fraud losses will rise from $84.2 billion in 2023 to $172.3 billion by 2028. If even 1% to 3% of those projected losses migrate to blockchain-verified proof systems, the protected value pool reaches $1.7 billion to $5.2 billion.
Frequently asked questions
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How did the Hakuhodo and LG blockchain ad pilot actually perform?
The pilot ran in Japan from July to August 2025 with 3,500+ participants and ten advertisers. It reported a 50% increase in click-through rates and a 15-point improvement in bounce rates, with every impression logged on-chain and served only to World ID-verified human users.
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What does Coinbase's Spindl acquisition add that the Hakuhodo model doesn't cover?
Hakuhodo and LG verify that a real human received an ad; Spindl verifies that the ad led to a real action — tracing the user journey from a web click to a wallet interaction, token purchase, or app install on Base, Coinbase's Ethereum layer-2 network.
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Why can't blockchain solve ad fraud on its own without additional verification layers?
A blockchain permanently records inputs but cannot validate them independently. If the identity verification layer is compromised before the record is written, fraudulent identities receive the same immutable receipt as legitimate ones — making the oracle layer, not the ledger, the critical trust point.
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