The wallet changes its address codes and has multisig properties, where wallet transfers need to be confirmed by several blockchain parties. We would recommend you to use phone or computer channel when creating an account since the information is encrypted and safeguarded better than through web browser. This is because Coinbase—the company—controls your bitcoins and not you. For ease of mind, presigned transaction are enabled uses nlocktime which means that each time your wallet has updates we will forward to you a presigned transaction unlocking the funds at a date in the future of your choice. These costs are charged by the GreenAddress but are not held by them, as they get transferred back to the blockchain network. If we have omitted important information regarding the GreenAddress guide, we would ask you to write us directly at BitcoinBestBuy and we will be sure to come back to you with needed answers. GreenAddress is a cryptocurrency storage platform, bent on providing service f...