user3932: I am currently running a testnet-node version 1.29.0.
To query the blockain, I use the command cardano-cli query tip --testnet-magic 1097911063 to get the last block.
What is the testnet-magic argument and why is it 1097911063?

I got the command from https://developers.cardano.org/docs/get-started/running-cardano

user88: The testnet magic, aka protocol magic, is a parameter introduced in Cardano during the Byron era. It is used internally by the protocol in cryptographic functions that construct addresses from a seed. Since this value is different in mainnet and testnet, the address obtained from a given path (or seed) is different in both networks.

3932: <p>I am currently running a testnet-node version 1.29.0.<br/>
To query the blockain, I use the command <code>cardano-cli query tip --testnet-magic 1097911063</code> to get the last block.</p>
<p>What is the testnet-magic argument and why is it 1097911063?</p>
<hr />
<p>I got the command from <a href="https://developers.cardano.org/docs/get-started/running-cardano" rel="noreferrer">https://developers.cardano.org/docs/get-started/running-cardano</a></p>
 88: <p>The testnet magic, aka protocol magic, is a parameter introduced in Cardano during the Byron era. It is used internally by the protocol in cryptographic functions that construct addresses from a seed. Since this value is different in mainnet and testnet, the address obtained from a given path (or seed) is different in both networks.</p>
