Open Source JavaScript Blockchain Software - Page 4

Design your new betting currency by choosing a blockchain to run on, a name for your coins and an initial supply. Then create your genesis transaction and import the new coins into your wallet. Next decentralize your currency by installing it on a bunch of different nodes and distributing the coins to any initial investors and stakeholders. PolyCash makes it easy to create a new cryptocurrency for sports betting or betting on any other topic. You can peg your currency to the dollar, the bitcoin or nearly any other source of value.

Visualize Solidity control flow for smart contract security analysis. Generates a DOT graph that visualizes the function control flow of a Solidity contract and highlights potential security vulnerabilities. A nice example of piping contract source that is in your clipboard through solgraph, dot, and preview: (Use whatever image previewer is available on your system; Preview.app is available on Mac) You have to have graphviz installed (brew install graphviz) to render the DOT file as an image. Depending on your permissions, you may need to add the unsafe-perm flag.

Simple wallet address validator for validating Bitcoin and other altcoins addresses in Node.js and browser. A lightweight library for validating wallet addresses across multiple cryptocurrencies.

Web3.js 4.x has been released. Checkout 4.x API documentation and migration guide for testing, early feedback and contributions. This is the Ethereum JavaScript API which connects to the Generic JSON-RPC spec. You need to run a local or remote Ethereum node to use this library. Additionally you can set a provider using web3.setProvider() (e.g. WebsocketProvider). We support types within the repo itself. Please open an issue here if you find any wrong types. If you are using create-react-app version >=5 you may run into issues building. This is because NodeJS polyfills are not included in the latest version of create-react-app.

Web4 is a new way to distribute decentralized apps. Deploy a single WASM smart contract to deploy the whole web app. You only need to deploy a single smart contract using WebAssembly to host your app's HTTP backend, static resources, and blockchain logic. There is an HTTP gateway to NEAR blockchain which allows smart contract to handle arbitrary GET requests. Every smart contract on NEAR also gets a corresponding API endpoint which can be accessed through regular HTTP requests. You can load any required data in web4_get by returning list of URLs to preload in preloadUrls field. Note that both JSON and form data are supported. When transaction is processed by server user gets redirected to wallet for signing this transaction.