Blockchain "engineering" has a lot illusions. Whenever you enter the DAPP (web page) which reads data from the blockchain - it reads it from a blockchain node, through a provider. Does it mean that DAPP creators operate a node and integrated a provider in their DAPP (web page)? In some cases yes but mostly not. So how is it…

The distribution of the ARB token implies a 27% allocation of the ARB token to the Arbitrum project team, and 17.53% to investors. Individual portfolios is only 11.62% of the allocation.

So how do we create a decentralized oracle? The model is as follows: a contract should ask several oracles to execute the same query, get results from each oracle, and then determine the correct answer on its own based on multiple results (answers from multiple oracles).

External data to the smart contract (from outside the blockchain) can be provided only, as parameters (arguments) of its call. Oracles are software running outside the blockchain, which listens for "requests" by smart contracts for external data, and then provides this data to the smart contract, by calling the appropriate…

Truffle Suite is the tool pack dedicated to Ethereum developers (focusing on smart contracts). That very actively developed project is currently one of the most popular frameworks for implementing, testing and running Ethereum based decentralized applications. In this article: I will describe the Truffle Suite tools; I will…