Diving deep into MPC-based wallets and Smart Contract Wallets (SCW) for the Web2-like wallet platform I am building. 
How do MPC wallets facilitate gasless & batch transactions while ensuring the wallet's address, not the Relayer's, is propagated to a dapp's smart contract?

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To mass onboard users, wallets should offer gasless transactions while propagating the wallet address to correctly interact with the dapps. 
For gasless txs, SCW seem like a better solution than MPC-based wallets. 
Curious to know what others think about this

Don't think MPC wallets with Relayer will be able to propagate the wallet's address as it is the Relayer executing the tx.
Whereas for SCW, the address is propagated as the Relayer is just calling the relevant SCW's function with tx as arg so that the SCW can execute it.

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Given the uncertain timeline on AA, I feel SCW with a Web2-like abstraction on top of it, would be an ideal solution to mass-onboard non-crypto native users and businesses.
SCW in its current state can already provide reliable gasless txs and time-delayed third-party wallet recovery

only way to do with MPC/ EOA is to have your own backend that relays signed transactions


signing and dapp infrastructure needs upgraded design to account for gas less txns aka wait for AA dream to come alive

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