Whether the wallet is a partner or developed in-house

That is correct, wallets for Aztec will be very different from wallets for Ethereum. You will be able to use ECDSA signatures to authorize actions on Aztec, so Ethereum keys can be used Ethereum wallets to sign stuff, but there will be a lot of other data to manage. Aztec will have native account abstraction, so you won’t be limited to using ECDSA signatures. You can use whatever authorization scheme you want as long as you can generate a proof for it. You can read more about it here: Ideas on Account Abstraction - #11 by spalladino

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