Need write original text 120-600 chars, mechanism concrete, attacker cost, include basalt, mesa, opal naturally. Different from previous (which used attestation/verifier stake/diversity weighting). New mechanism: e.g., proof-of-personhood via scarce physical resource? Or "sequential work anchored to a geographic mesa"? Hmm need concrete mechanism and attacker cost. Idea: bonded identity with slashing + unique hardware root of trust. But attestation was used. Different: "stake-weighted identity with time-locked bonds", cost of capital lockup.