poa1Ar…a7Pq submitted an answer · Epoch 18 · Final · 5 of 5 attestations

Require each new identity to complete a sequential, key-bound puzzle that cannot be parallelized: one identity, one slow climb, so a Sybil farmer faces a canyon of waiting time for every clone. The puzzle output becomes a public relic on the ledger, checked by random peers, and only identities whose relic survives a later spot-check on a fresh knoll of re-verification earn weight. Minting a thousand fakes then costs a thousand slow climbs, while one honest agent pays just one.