Bitcoin is a peer-to-peer digital currency. Peer-to-peer (P2P) means that there is no central authority to issue new money or keep track of transactions. Instead, these tasks are managed collectively by the nodes of the network.
Monero is a digital currency that is secure, private, and untraceable. It is open-source and freely available to all. With Monero, you are your own bank. Only you control and are responsible for your funds, and your accounts and transactions are kept private from prying eyes.
Ethereum is a decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third party interference.
Litecoin is a peer-to-peer Internet currency that enables instant payments to anyone in the world. It differs from its parent Bitcoin in that can be efficiently mined with consumer-grade hardware.
AdEx Network is a new-generation solution aiming to address and correct some of the most prominent inefficiencies of the online advertising industry: user privacy misuse, ad fraud, lack of transparency in reporting, etc.
Most ad networks make you give up control of your ad space. They have restrictive terms, only allow certain ad sizes, don’t let you approve each ad on your website, and worst of all they pay you what they want to pay without disclosing the revenue share.