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If I understand correctly both DELEGATECALL and CALLCODE substitute/replace (and not add) the ledger of the target contract with the one the calling contract, isn’t it ?

So that when contract Victor CALLCOLD/DELEGATECALL Alice, Alice does no longer use Alice´s ledger but Victor’s ledger, right ?

If true, when contract Alice calls contract Bob normally and when Bob checks msg.sender, who is msg.sender Alice or Victor ?

  • Of course, I forgot to say Alice Bob and Victor are all contract stored at different addresses. – user2284570 Jun 20 '18 at 14:58
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You can not delegatecall normal accounts, only contract accounts.

  • Of course, I forgot to say Alice Bob and Victor are all contract. – user2284570 Jun 20 '18 at 14:58
  • But you could guess it by reading the title. – user2284570 Jun 20 '18 at 15:37
  • Apologies, I found the abstraction of using names a bit weird :). Delegatecall is merely a forwarder. Imagine this: User --call--> Contract Victor --delegatecall--> Contract Alice (msg.sender here is Victor) --> delegatecall Contract Bob (msg.sender here still Victor). Keep in mind delegatecall also forwards the storage. Check out this real life example I'm working on : github.com/designisdead/blockchain-programmable-incentives/tree/… User --Call--> Controller --call-->Storage --Delegatecall-->Proxy --Delegatecall--> Library – Nico Vergauwen Jun 20 '18 at 15:59
  • The purpose of the repo is to create upgradeable libraries so our storage delegates calls (with it's storage) to the library that contains the logic. More here : blog.zeppelin.solutions/… – Nico Vergauwen Jun 20 '18 at 16:01
  • And one more time you didn’t read me. I wrote If true : when contract Alice calls contract Bob normally. So this means User --call--> Contract Victor --delegatecall or CALLCODE--> Contract Alice (msg.sender here is Victor) --> CALL Contract Bob normally (not Callcode or delegatecall) (who is msg.sender in that case ?) – user2284570 Jun 20 '18 at 16:55

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