Under MiCA, a Class 3 Custodial Lien allows a Crypto-Asset Service Provider (CASP) to legally "encumber" or "lock" a client's assets (like EURC shards) as collateral.

This process is critical for bridging DeFi and TradFi. It enables the issuance of traditional financial instruments, like a Stand-By Letter of Credit (SBLC), backed by digital assets. The lien is recorded, cryptographically signed, and auditable, ensuring full compliance with MiCA's asset protection rules.