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Bitcoin

On Bitcoin, users interact with Multisigs (operated by ALEX LAB Foundation, with a plan to decentralisation) to lock assets to be bridged ("source asset"), and on L2s to receive the L2 asset ("destination asset").
Additionally, users on Bitcoin may provide additional data (OP_RETURN) to trigger certain smart contract interaction on their behalf automatically by Bitcoin Bridge.
Multisigs are Bitcoin wallets that are operated by multiple signers. In contrast to a typicall wallet requiring just one party to sign a transaction, a multisig requires multiple parties or signers to sign a transaction.
ALEX partnered with Asigna who is "a native multisig solution tailored for Bitcoin and Stacks made specifically to offer an extra layer of security to trusted wallets on both ecosystems."

Multisigs