NuLink

NuLink is cryptographic infrastructure that provides privacy capabilities for decentralized applications, combining proxy re-encryption, identity-based encryption, ciphertext-policy attribute-based encryption, zero-knowledge proofs and fully homomorphic encryption: data is encrypted client-side before entering cloud or distributed storage, authorized recipients decrypt by policy, compute nodes run inference on ciphertext without touching plaintext, and ZKPs verify data authenticity and node behavior. Its early form was a project bridging the Threshold network, formerly NuCypher, into Polkadot, using Nuproxy and Policy modules to move staking information and policy fee settlement on-chain.

In the privacy computing track, NuLink differs from FHE-native chains by delivering capabilities to developers through APIs and a browser plugin, with nulink-agent providing file encryption, sharing and authorization and watcher nodes relaying network state from Ethereum to other chains. The main code repository's commits concentrate in 2021 and 2022, and the parachain bridge exists as Nuproxy and Policy modules documented in the repository.