that i will give someone access to my wallet by mistake ? Or claiming airrop is safe?
The chain id acts as a safeguard, it ensures a signed transaction cannot be broadcasted unto one of the other chains you have funds on
I was involved with a EVM testnet that had the same chain id as eth mainnet and Metamask stepped in to force them to change the chain id due to security concerns. So I suppose it is possible for someone to set up a chain with the same chain id as another chain and propagate a tx on their chain onto the other chain... Always do your due diligence when dealing with promised free money
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