Nexus is built to verify the authenticity, as well as the computation of data. It is powered by a seven-layered software stack operating as a 64-bit register-based process virtual machine (an interpreter) rather than a stack-based script, EVM, or JVM. Each layer carries out a specialized process increasing the efficiency of contract processing.
A Signature Chain generates one-time-use private keys that are derived from your Nexus wallet credentials (Username, Password and PIN). A Signature Chain is a personal identity on Nexus, which records all of your transactions and ownership history of digital assets. You no longer have to manage key and wallet backups, or use a plug-in such as Metamask.
Signature Chains enhance the security of existing DSA (Digital Signature Algorithm) by publishing only the public key’s hash until the key is used, while deterministically generating a new key once the old key is used. This results in high levels of security, as the attack window to brute force a private key is reduced to 500 ms. Signature Chains utilize the following cryptographic functions: FALCON (a second round contender for the NIST Post-Quantum cryptography competition), Argon2 (winner of the password hashing competition, and a superior alternative to S-Crypt or B-Crypt), and Keccak (winner of the SHA3 competition).
The Three-Dimensional Chain (3DC) is designed to solve the 'Blockchain Trilemma', an opinion that only two of three qualities; Security, Decentralization, and Scalability, are achievable concurrently. The 3DC has three consensus layers that check and balance one another creating security and decentralization, while the foundation layer aggregates sharded state, to achieve scalability.