Sites such as Etherscan and Polygonscan read and show the balance of native tokens of many addresses and the balance of internal contract tokens (ex ERC20).

Do these sites get all address data from node through (json-rpc API)[https://ethereum.org/ko/developers/docs/apis/json-rpc/] every time?

Or, when you show it on the site, Does the site read and show the data of the node's state file directly?

If you are operating a node, I wonder if it is possible to read the balance of addresses by block height as if reading a file rather than json-rpc API.

The current goal is to find out the balance of all addresses whose balance is changed at a specific block height... The problem is that the speed is not enough to call json-rpc every time...

Sites such as Etherscan and Polygonscan read and show the balance of native tokens of many addresses and the balance of internal contract tokens (ex ERC20).

Do these sites get all address data from node through json-rpc API every time?

Or, when you show it on the site, Does the site read and show the data of the node's state file directly?

If you are operating a node, I wonder if it is possible to read the balance of addresses by block height as if reading a file rather than json-rpc API.

The current goal is to find out the balance of all addresses whose balance is changed at a specific block height... The problem is that the speed is not enough to call json-rpc every time...