Vitalik Buterin
@vitalik.eth
What are people's definitions of an "L3"? Particularly, is it an architectural classification (whether or not there's some kind of intermediary between it and L1), or a security classification (can the attacker steal? can they freeze funds? can they steal/freeze but only at high cost?)
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Austin Marrazza
@za
L3s settle to an L2. For example, Arbitrum Orbit chains settle to Arbitrum One. This allows for cheaper bridging, if a user withdraws from CEX to L2, then bridges to L3. Rather than withdraw to L1, then bridges to L2.
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