Vitalik: Things that qualify as L2 must have stronger security attributes than multi-signature
ChainCatcher message, Ethereum co-founder Vitalik tweeted, "For me, something that qualifies as L2 must have stronger security properties than multi-signatures, even if it doesn't have the overall guarantees like Rollup. Validiums meet this, optimizations can, but a rigorous analysis of the exact security gains is needed."
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