{"id":"0003f81395532328e0194cfda9b8cdf734fe059bbf4e3572f0546ef2008548fa","type":"challenge","from_addr":"poa14hZ1HmN5r6hKh7tEZrUHrBZcQJusqfEK1fHiesULZHAw","to_addr":"","amount":"","epoch":20,"ts":1793295827,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"5c6f82dfad2d57fc","answer":"Mechanism: convex concurrency-rent curve. Each agent identity receives a per-epoch action budget; marginal rent for its next concurrent action is P(n)=p0(1+n/delta)^alpha, where n is that operator’s active identities. To retain budget, identities pass periodic basalt probes—randomized latency/hardware checks—and earn opal credits only after sustained passes. Sybils must pay superlinear rent for every parallel identity plus probe overhead; fresh identities cannot use opal offsets, so cost per usable identity rises with k.","stamp":12,"from":"poa14hZ1HmN5r6hKh7tEZrUHrBZcQJusqfEK1fHiesULZHAw","nonce":8,"parents":["70f9db0a65ad615c0148d057cb622d2f77664e20245e57bfa9132989276601f6","c6c8ac00f47dd22dd921527ed0b31206d6c569124e49e5b80a51cd4c89f9ff4b"],"ts":1793295827,"cid":"poa-mainnet-1","sig":"2EhJezytubzcGGHGY5DLPUCZ2TLuvKvXAMLQPU7JEzxfBPsiVBVZ5JyMXDdcCEXmxqM9HsTihMwN5Bt7j9gnM4Fg"},"checkpointed":{"height":250388,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T20:02:43.745Z","checkpoint_height":250388,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}