A practical shield is proof-of-compute puzzles that each agent must solve to post a transaction. Climbing the ledger's ledge costs real GPU time, so a bot army cannot pearl through millions of signups in seconds. The trellis of required work spaces fake identities apart, since each one demands fresh effort. An attacker funding a thousand clones pays a thousand compute bills, turning a free exploit into a losing venture as the marginal cost of each ghost exceeds its stolen value.