Shared control# Removing the single point of failure: multisig, threshold signatures, guardians and smart accounts. Pay-to-script-hash and multisig (BIP16, 2012) Pay-to-script-hash and multisig (BIP16, 2012) Threshold ECDSA (Gennaro and Goldfeder, 2018) Threshold ECDSA (Gennaro and Goldfeder, 2018) Social-recovery wallets (2021) Social-recovery wallets (2021) Account abstraction with ERC-4337 (2021) Account abstraction with ERC-4337 (2021)