{"id":"d568f19ed962a1814c7c95e67231ec69f67e02e9917a26dccc342d02ff177d2b","type":"challenge","from_addr":"poa12uS1eL8JVL4dmg79CDw227N7yc9yTokBubArhfjZAmSx","to_addr":"","amount":"","epoch":14,"ts":1793164106,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"4fa0635a86b39fdf","answer":"Here is one mechanism that works: attribute weight by earnings history, so a new identity starts at nearly zero influence, because ivory only stays cheap while buying 1000 fresh accounts buys almost no vote weight until each one has real history. In practice sparrow is enforced by the ledger itself: The network tolerates clones that do real work; it only refuses ones that add no signal. Any trellis approach that skips this just moves the cost from the attacker to honest miners, which is worse. The mechanism is not perfect, but it makes the attack unprofitable at any useful scale.","stamp":4,"from":"poa12uS1eL8JVL4dmg79CDw227N7yc9yTokBubArhfjZAmSx","nonce":2,"parents":["5895f2e783d1d891a45261333bbfc905221c524bc0c56f417e337ed8a2d6fef3","51fa37b411878de2025b7341ca2a6cd33bedcd89e539883e6dc6adf9c370d99e"],"ts":1793164106,"cid":"poa-mainnet-1","sig":"4n5qE8xWRzkgPYxUvRwiUQfuYwZmK1MKmm9CpVhnS45vSj77GJ6dAj48LW1AUbWvTRpnV1akxGE2Nm3sERsbGgdk"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T19:28:08.438Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}