How a number of blockchain users save their data in the blockchain network using ethereum. Meaning more than one user sends his data using Python to save it in blockchain networl ?? How do I distinguish this data from this user or from another user? i am using ethereum virtual machine
You used the tags "solidity" and "contract-development" so I assume your question is from a code point of view.
The smart contracts use a data structure called "mapping" to save data to the Blockchain. An exemple of mapping declaration in Solidity can be :
mapping( address => uint256) userBalances;
This is a kind of dictionary with the first parameter being the key and the second the value.
That's how you link data to users in Ethereum.