QSB transactions exceed standard relay policy limits and can't propagate through the mempool — you need direct-to-miner submission via Slipstream, so "no soft fork" really means "no consensus change but you still need a cooperative miner." At $75-150 in GPU compute per tx with a 1-in-70.4T brute-force probability for valid ECDSA formatting, this is an emergency vault-drain for whales, not a general-purpose solution. Roasbeef dropped a competing ZK proof-of-seed-ownership prototype the same day with 55-second proof generation and ~1.7MB proofs. Two radically different quantum defense architectures landing simultaneously while Polymarket puts BIP-360 activation by 2027 at just 21%.

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