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When transactions are made the sender is identified by his signature. But Contracts dont have a private key to sign any transaction or message. So I have some questions:

Can a Contract initiate a transaction? I mean transfering ETH from his account to another EOA or Contract. And if yes, will this transaction be included in the transaction list? And how do they sign the transacion?

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No, contracts can't initiate transactions.

But yes, they can transfer ETH and make calls to other contracts, etc., but only as part of a transaction initiated by an externally owned account (EOA).

Etherscan calls those "internal transactions," but they're not technically transactions at all.

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  • Then if Contract A transfers ETH to my account, I wont know where it came from until I look into the transaction that triggered the contract and see the code?
    – hadamard
    Mar 11 '19 at 22:55
  • Well, Etherscan will just list it (as an "internal transaction"). I think many tools will do the same.
    – user19510
    Mar 11 '19 at 23:58

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