Several blockchain projects are proactively integrating quantum-resistant features: $BTC
Quantum Resistant Ledger (QRL): Specifically designed to be secure against quantum attacks, QRL employs the eXtended Merkle Signature Scheme (XMSS), a hash-based signature method considered quantum-resistant. $ETH
IOTA's Tangle Network: IOTA is exploring quantum-resistant cryptographic methods to enhance the security of its unique directed acyclic graph (DAG) structure.
Bitcoin Post-Quantum (BPQ): A project aiming to adapt Bitcoin's protocol to incorporate lattice-based cryptography, enhancing its resilience against quantum threats.