[Ethereum] ny difference between address that have Smart Contract and “normal” one?

addressespublic-keywallets

Is there any difference between address that have smart contract on it, and "normal" address (address that You can create private and public key pair)?

For more context, this is the problem I'm thinking about:

Let's assume that Smart Contract has address 0xfoo, and we – either by pure random chance, or we generated somehow collision – also generated address 0xfoo.

Can I now access ether and/or tokens that are on 0xfoo Smart Contract address? Or there is some mechanism in EVM to block transactions from "Smart Contract Address"?

Best Answer

The only difference between a smart contract address and a "normal" address is that the smart contract address contains (the smart contract) code. Other than that, they work the same.

If there is, for example, a contract on 0xfoo and by random chance you get the private key for this address, you can transfer Ether and tokens from this address like any other address. If the contract itself is a token contract, that does not mean you can transfer those tokens, unless the contract itself is the owner of those tokens (when balanceOf(0xfoo) > 0).

Related Solutions

[Ethereum] Get public key of msg.sender in a smart contract

Contracts cannot access the public key of the sender, since the raw transaction data is not visible to contracts. However, given the public key, you can verify that it does in fact match the address of the sender by re-deriving the address from the public key.

In Solidity it would look something like this:

function checkPubKey(bytes pubkey) constant returns (bool){
    return (uint(keccak256(pubkey)) & 0x00FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF) == uint(msg.sender);
}

[Ethereum] How does Ethereum avoid address collision

I think this answer might be what you are looking for.

Is each Ethereum address shared by (theoretically) 2 ** 96 private keys?

There is no difference between testnet accounts and main-net accounts, you can move accounts between them, but of course transactions done in one net have not happen on the other.

Contracts live on the block chain, so they are unique to the current test/main network. if someone (speculating) creates a contract with the same address as a contract on another network, it doesn't mean anything and doesn't grant them any powers to the contract with the same address on the other network.

It's the contract owner account private key that is important (as the creator/owner).

Best Answer

Related Solutions

[Ethereum] Get public key of msg.sender in a smart contract

[Ethereum] How does Ethereum avoid address collision

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