Contract verification on Etherscan in Blockchain / Solidity - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the contract address for verification.

Blockchain / Solidity

const contractAddress = '[1]';

Drag options to blanks, or click blank then click option'

A0x1234567890abcdef1234567890abcdef12345678

BcontractABI

CetherscanAPIKey

D0xabcdef

Attempts:

3 left

💡 Hint

Common Mistakes

Using the ABI or API key instead of the contract address.

The contract address must be a full Ethereum address string to verify on Etherscan.

2fill in blank

medium

Complete the code to set the Etherscan API key for contract verification.

Blockchain / Solidity

const apiKey = '[1]';

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AYOUR_ETHERSCAN_API_KEY

BverificationStatus

C0x1234567890abcdef1234567890abcdef12345678

DcontractAddress

Attempts:

3 left

💡 Hint

Common Mistakes

Using the contract address or other variables instead of the API key.

The API key is a string provided by Etherscan to authorize verification requests.

3fill in blank

hard

Fix the error in the verification function call by completing the method name.

Blockchain / Solidity

await etherscan.[1](contractAddress, sourceCode, apiKey);

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AdeployContract

BgetContract

CcompileSource

DverifyContract

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated method names like deployContract or compileSource.

The correct method to verify a contract on Etherscan is 'verifyContract'.

4fill in blank

hard

Fill both blanks to create a dictionary with contract address and API key for verification.

Blockchain / Solidity

const verificationData = { address: '[1]', key: '[2]' };

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A0xabcdefabcdefabcdefabcdefabcdefabcdefabcd

BcontractABI

CYOUR_ETHERSCAN_API_KEY

DsourceCode

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the API key and contract address values.

The 'address' field needs the contract address, and 'key' needs the Etherscan API key.

5fill in blank

hard

Fill all three blanks to complete the verification function call with address, source, and API key.

Blockchain / Solidity

await etherscan.verifyContract('[1]', '[2]', '[3]');

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AcompileSource

BsourceCode.sol

CYOUR_ETHERSCAN_API_KEY

D0xabcdefabcdefabcdefabcdefabcdefabcdefabcd

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of arguments or using incorrect values.

The function requires the contract address, the source code filename, and the API key in that order.