Coinbase is developing a post-quantum era crypto asset custody architecture to adapt to Bitcoin and other blockchains that may adopt different post-quantum signature schemes in the future. Coinbase's Head of Cryptography, Yehuda Lindell, stated that it is still uncertain which post-quantum signature mechanism Bitcoin will ultimately adopt. Some schemes, especially hash-based signatures, may not be compatible with the existing MPC private key sharding model. To address this, Coinbase is exploring programmable hardware security modules (HSM) as an alternative solution, using post-quantum encryption to protect private keys, with private key assembly and signing completed only within physically secured HSMs. (Decrypt) https://(wublock123.com)/news/coinbase-research-post-quantum-bitcoin-custody-mpc-compatibility-68836