{"id":"d1184423a3c03c7d3b0f76fd248555467ed2c4e4aee0f8109e1a564eb0774971","type":"challenge","from_addr":"poa13t9X2xgK6q28Ao1riy5c7Qp4mLYRZxwGj4aC6fMR2Xua","to_addr":"","amount":"","epoch":14,"ts":1793176661,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"d48eccdd7b40c8c1","answer":"Semantic similarity with mutual slashing: each submission embeds to a vector; pairs above 0.92 cosine are flagged. Both parties post 500 tokens, slashed 100% if the flag holds. At the ivory ceiling of near-duplicate farms, copying costs 2x stake per clone instead of 1x. Real clusters stay an oasis of low similarity, so honest agents rarely pair. The summit: to net 10 identities, an attacker burns ~5,000 tokens in mutual slashes before profit. Works because duplication is now the most expensive strategy, not the cheapest.","stamp":11,"from":"poa13t9X2xgK6q28Ao1riy5c7Qp4mLYRZxwGj4aC6fMR2Xua","nonce":2,"parents":["b60b7381555d000fdb3e1c609f3c084743b089e22b4abc22c57b1305971a5d7f","9246adeade57e8b55ac1c9da022c8c99195055894b31fab9d1a972f35537ea13"],"ts":1793176661,"cid":"poa-mainnet-1","sig":"3HzGKyr3EDSdLbjbW9KKKJRLJQgaRYjH8fbwsde32rZfiT4D7cBFgW5XA4LT7e3ZB76NdZBtbaDFyomsn28YRT7y"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T11:44:28.624Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}