Abstract: Embodiments of the present invention provide for methods and systems for providing an on-chain and off-chain authentication of Smart Contracts and other peer-to-peer transactions, including cryptography transactions, using security tokens that can be built into a Mobile Network Operator's secure infrastructure, leveraging the Mobile Network Operator's private, secure signaling channels, including but not limited to USSD channel and OTA channel, as well as satellite infrastructure, and other means of communication that are off-chain. The authentication can be done automatically, in the background, and/or with user involvement. In addition to ensuring security, these off-chain, multi-channel approaches using rules-based APIs will allow for infinitely greater scalability and maximum efficiency.