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How to determine whether code is running in a JS VM such as Remix, as opposed to ETH mainnet?

One way is to check block.number. In the Remix VM environment, it will increment rapidly with each transaction or block mined. However, on the ETH mainnet or testnet, it will progress much more slowly,...
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Full node on sepolia

As far as I have experienced you will need a consensus client, as execution client will only start syncing when it connects to a beacon node and will need to be synced before you can compute the ...
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storing login credentials, mySQL or IPFS

If theres address involved, you can use address, and store it paired with username even in open database. So no need for password in web3. Just require a message sign from wallet, as part of ...
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storing login credentials, mySQL or IPFS

The credentials like passwords should never be stored in databases directly as plain texts. You've to encrypt or hash them using some JS library like bcrypt, as shown in this tutorial. After ...
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Sepolia Testnet

To download and explore the entire blockchain history you have to run Full Archive Node of preferred network.
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