 So I'm Kevin Atigachie from the LIMOS lab and I'm going to talk about proof of behavior. It's a preliminary work in collaboration with Paul-Marie Goldmund from the LMBP, Pascal LaFourcade from the LIMOS and Ariane Tichit from the CERDI. So for the outline plan, I will start by your short introduction. I will record well-known things about Bitcoin. Then I will talk about related works before introducing the new notion of a proof of behavior and a new cryptocurrency that builds upon it before concluding. So in Bitcoin, we have a pool of miners that need to serve a complex cryptographic puzzle to create a new block and get re-warded. So this cryptographic puzzle consists in finding a nonce and such that the hash function applied to the hash of the last block, the block of transactions, and the nonce returns the hash value that is lower than the given threshold. And finding this nonce is highly computation-intensive task and that, at the contrary, verifying it is easy. So the first major problem of this proof of work is that the overall Bitcoin mining consumes much more energy than some countries. For instance, we see that Bitcoin consumes more than Switzerland. Besides, the computations done for constructing this proof serve no purposes. So besides these two backs, we have the Bitcoin blockchains that have proven to be useful to keep tracks of transactions. And we have a lot of applications that rely on blockchains like identity management, document certification and tracking, online voting and eOption. And since Bitcoin, we have a lot of cryptocurrencies like Ethereum, Peercoin, Dogecoin or Ripple to name just a few which are classified in four categories. We have SCAM, which are designed quickly and are not secure. Their only goal is to convince people to invest money in them. We have the clients of Bitcoin or Ethereum which are dedicated to some special purposes, like for instance, poker coin for playing poker. We have some coins like prime coins, pure coins, folding coins, which have a proof of work. Aiming at serving a new is useful goals, for instance, for solving medicine or mathematical problems. And some of them rely on a new paradigm for establishing the consensus. For instance, proof of state, proof of space, proof of reachability or proof of elapsed time. No. So our aim is to propose a new cryptocurrency, eCommerce Bitcoin, based on a new consensus algorithm that serves a new goal, the incentivization of green barriers in terms of mobility. So the closest related projects are Solar Coin, whose aim is to reward the producers of solar electricity at the rate of one solar coin per megawatt hour of solar energy. And we have Mobicoin, a project of cryptocurrency presented by Mercedes-Benz in 2018, whose goal is to collect users that the data and reward with Mobicoin, the drivers that have a neological drive. So unfortunately, today Mobicoin is not yet used, and there is a lack of information about its status. So the aim of eCommerce Bitcoin is different, since we reward both collaborative mobility and zero emission mobility, like walking and biking. Here we have graphical representations that ranks the personal transportation modes by increasing order of greenhouse gas emissions. And this gives us insights in how proportionally should the individuals be rewarded. With us introduced the notion of proof of behavior, we're instead of proving that we perform conventional intensive tasks, we have to prove that we do positive actions in the real world. And these positive actions then enable the generation of coins. So there are several advantages to replace proof of word by a proof of behavior. No specialized hardware like azix or GPU are required for mining. Anyone can select the green behavior she wants to confirm to generate coins, and there is no waste of energy. So as Bitcoin, eCommerce Bitcoin is just centralized, and everything is written and publicly available. So in the proof of behavior paradigm, the right to write in the blockchain is not given to the miners that have a lot of computational powers as in Bitcoin. But it is, in fact, a chart between several actors, the user, the prover, the verifier. So the user who performs transactions like buying food or any object, the prover realizes the proof of behavior, for instance, by walking or biking. The verifier verifies the validity of proof of behavior and the validity of transactions. So in fact, once they are verified, the PUB and transactions are written in the blockchain. And the first application of proof of behavior is the design of a cryptocurrency that incentivize less emission in the transportation by rewarding transportments like walking or biking. And for these two modes, proof of behavior is in fact a real GPS trace that is collected and signed by a simple smartphone. The signature is in fact necessary to prove that the smartphone was not involved in several traces at the same time. And for other behaviors like the use of public transportation or carpooling, we have several GPS traces that need to be collected and compared to checks that are actually similar. So to conclude, proof of behaviors is a nice paradigm to incentivize green behaviors and provide sustainable mobility. As for the proof of work, we have many proof of behavior-based applications that can be considered. But to concretize EcoMobicon, EcoMobicon, several requirements need to be addressed. We need, for instance, the development of an efficient pattern recognition algorithm to accurately recognize transport modes, as well as a cryptographic algorithm for ensuring the privacy of individuals in compliance with the GDPR. Thanks for your attention.