First, the data of Ethereum needs to be stored in the hard disk with the user name. First, the private key can be backed up, but the wallet can be deleted. There are other more detailed operations.

Original title: "Decoding Ethereum Smart Contract Data" As we discussed in the last article, smart contract transactions are similar to back-end API calls in smart contract-driven web3 applications. Details of each smart contract transaction and the resulting application state change.

All kinds of operations in Ethereum need to pay gas, such as storing data, creating contracts, performing hash calculation, and the highest handling fee that the initiator is willing to pay in one operation.