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Multisig serves as a fundamental security layer by requiring more than one signer to move funds. On Bitcoin and the @Liquid Network , implementing this is simple thanks to native opcodes (e.g., OP_CHECKMULTISIG) or Schnorr-based interactivity, keeping the code surface small and secure.
On Ethereum, however, developers must create custom code to emulate multisig—leading to complexity, increased computational demands, and potentially flawed interfaces.
Ethereum contracts must manage on-chain state, handle reentrancy (where an attacker calls a contract in the middle of its own execution), and ensure that the logic for multiple signers is correctly enforced.
Ethereum also uses an account-based model with a universal state tree, meaning each contract update can influence or interact with data used by other contracts.
Mistakes in these areas can introduce critical vulnerabilities, as we have seen with high-profile incidents like the Ethereum Parity wallet hack in 2017 and now with Bybit.
While Ethereum contends with repeated contract exploits, Bitcoin and its sidechains are evolving toward more robust multisig approaches. For example, cryptographic schemes like MuSig aggregate multiple signatures into one, making multisig transactions look like standard singlesig. This benefits both privacy and efficiency.
Looking further ahead, the proposed Simplicity language on the @Liquid Network aims to provide the flexibility of a higher-level scripting language while retaining Bitcoin's careful approach to security.
