Biconomy v2
ERC-4337 smart contract account from Biconomy.

What is Biconomy v2?
The Biconomy's Modular Smart Account is an ERC 4337-compliant solution that works with any Paymaster and Bundler service. Biconomy Smart Accounts are signer agnostic, which means you can use any authorization package as long as a signer is passed to our SDK during Smart Account creation.
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Developer resources from Alchemy

ERC-1271 signature replay vulnerability
On October 27th 2023, Alchemy discovered a ERC1271 contract signature replay vulnerability that affected a large number of smart contract accounts (SCA), and led to risks when interacting with several applications.

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