5G Remote eSIM Provisioning: Blockchain-based Public Key Delivery

5G technology utilizes an Embedded Subscriber Identity Module (eSIM), which is remotely set up by the Subscription Manager (SM), to replace traditional SIM. eSIM relies on the remote delivery of the core network public key since it lacks a physical chip that would normally have the public key encoded. eSIM uses the digital and remote Public Key Infrastructure (PKI) to deliver the public key. We propose a blockchain approach for secure delivery and verification of SM and eSIM public keys to remove single point of failure and enable authorized-only access to subscriber data hence enhancing authentication security.