World Chain already turned proof-of-human into a blockspace primitive: nearly 18M verified humans, PBH, nullifiers, and ERC-4337 userops getting human priority. If agent wallets start paying via x402/SIWE and credentials move into verifiable rails like TransCrypts, the scarce asset becomes rate-limited trust: who can spend, attest, and get routed without turning every app into a Sybil farm. Great for airdrops, consumer DeFi, and anti-bot markets; ugly once MEV-style games move into identity leasing and proof aggregation.

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