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I am facing issues trying to verify a contract that I deployed on Rinkeby.

My contract constructor has 3 parameters, how do I pass values of these parameters in the contract verification form?

How do I determine the constructor ABI for my contract. Btw, I am using compiler version 4.11 and the contract was built using truffle framework.

Any help would be truly appreciated.

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  • 1
    What types were the parameters?
    – Tjaden Hess
    Jul 9, 2017 at 18:33
  • (address, uint, uint) => first is an address to which proceeds of the contract will be forwarded to, the second is the starting block number, the third is the ending block number.
    – Parthasarathy Ramanujam
    Jul 10, 2017 at 17:48

2 Answers 2

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Now it is very easy with ABI-encoded Online Converter

Step 1: Add parameters that you used to construct your contract

Step 2: Click Generate ABI

Step 3: Copy ABI-Encoded

Step 4: Back to Etherscan and pasted it to ABI-Encoded Textbox

enter image description here

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For simple value types like address and uint, you just need to left-pad the values to 32 bytes and concatenate them.

For example, if my values were

  • 0x829bd824b016326a401d083b33d092293333a830
  • 4
  • 177772

the proper ABI encoding would be

000000000000000000000000829bd824b016326a401d083b33d092293333a8300000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000002b66c

For more complicated types or to do this automatically, you can use this JS tool

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