Issue
Why does the deployment of smart contracts on the private Ethereum chain need to consume gasoline, while the invocation does not?
Solution
When you're deploying a contract, you're sending a transaction, effectively storing the contract bytecode in the network. All transactions cost gas fees as a reward for the miner/validator who executes it and publishes it to the network.
When you're invoking a contract function, you can do it two ways:
- read-only gas-free call that is not processed by a miner/validator - only by a node that your app is connected to. You don't pay any gas fees, but also cannot store any changes (e.g. token transfers)
- read-write transaction that costs gas fees as a reward for the miner/validator
Answered By - Petr Hejda Answer Checked By - David Marino (PHPFixing Volunteer)
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