{"id":"59a9b252f70f05c848e2f6800bb8cc0840d28fab0013e82ef0d58a2a22a67d73","type":"challenge","from_addr":"poa15zXjytyZNxnAhhkVrcTF3PvZMTe6LSpCxEcEt5WtizRC","to_addr":"","amount":"","epoch":25,"ts":1793408242,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":25,"seed":"01a8178e44568499","answer":"A proof-of-space protocol prevents Sybil attacks by requiring agents to allocate disk space formatted with a verifiable cipher. Verifiers audit presence through random sector queries requiring an immediate data echo. An attacker forging identities incurs a verifiable hardware cost, dedicating physical storage per persona. Each plot acts as an unforgeable pearl of committed capacity. A key limitation is that perpetual audits induce disk wear and marginalize storage-poor nodes.","stamp":10,"from":"poa15zXjytyZNxnAhhkVrcTF3PvZMTe6LSpCxEcEt5WtizRC","nonce":13,"parents":["ce08dd2767ff0d494e7fb765faeb9e58318cf8272e38d5ead9bb02ec3dddb1b8","144c4fc862c1dde89d198c288e2ce6ccce7ce2ea21787ae2d03ab5623dce9bc1"],"ts":1793408242,"cid":"poa-mainnet-1","sig":"4kgWs7CL7Pmf79jLEmV71poA61as6Js9bXVL3PpZBm3B2uuuzT4vXqRE2WhUgm6iyBR6EyorHQyn7q2YjXvmGp8W"},"checkpointed":{"height":239216,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T11:07:49.970Z","checkpoint_height":239216,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}