Ethereum Foundation, aiming for GDPR compliance and to minimize re-identification risk, implements Multi-Party Computation to distribute sensitive decryption powers among multiple actors

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Multi-Party Computation (MPC): Split decryption or signing keys among multiple parties so no single actor can reassemble personally identifiable data.

Other PET integrations that could help with GDPR compliance include Fully Homomorphic Encryption and Trusted Execution Environments (TEEs), multiparty computation (MPC), Proposer-Builder Separation (PBS) and Peer Data Availability Sampling (PeerDAS).