ProductChain Requirements: MetaMask Browser plug-in or Etherium Client configured for Etherium Testnet (ID=3) Ethereum wallet (could be empty for using client page) URLs: https://joro2404.github.io/ProductChain/sellers/index https://joro2404.github.io/ProductChain/sellers/transfer https://joro2404.github.io/ProductChain/sellers/confirm https://joro2404.github.io/ProductChain/UserUI/