Nano has been around for years now, instant, feeless transfers. Its useful, but nobody is using it. It gets spam attacked every bull run as well which suggests certain influences dont want it to ever take off. https://nano.org/en. - Source: Hacker News / 2 months ago

Hi /u/oroscor1! Congratulations! Can you make a Nano (https://nano.org/en) wallet so I can send you some coin? By using Nano we can avoid the high transaction fees of BitCoin and PayPal. Source: over 1 year ago

Nano’s network is validated through a Open Representative Voting (ORV) consensus mechanism. They have fallen victim to a 51% attack in the last and attackers were able to double spend funds. Is it possible for this same attack to allow the sender address of a transaction to be spoofed? Source: over 1 year ago

There’s a better decentralised digital currency now called Nano that aims to be a borderless, permissionless currency for the unbanked masses. Source: over 1 year ago

Nano is a blockchain with an acyclic structure and, thus, high throughput. Developer Colin LeMahieu launched the project in 2014, and it was initially called RaiBlocks, but in 2018 it became NANO. The project's main goal was to initiate a massive adoption of NANO everywhere as a paying method without using smart contracts and dApps built upon them. The team wanted to get rid of other blockchains' drawbacks. Source: almost 2 years ago

For a more decentralized approach, TrueBit offers a solution for off-chain computation. It involves solvers and verifiers who perform computations and verify them. In case of a challenge, an iterative verification process takes place on-chain. Ethereum miners act as judges to make a final ruling. TrueBit creates a computation market where decentralized applications can pay for verifiable computation outside of the... - Source: dev.to / 11 months ago

Yes, it is on truebit.io site: "Truebit combines with bulletproofs to achieve compact, zero-knowledge proofs without trusted setup. ". Source: over 1 year ago