Stack Exchange

Shane Fontaine

https://hop.exchange

Currently building Hop and Authereum.

I audit code and work on blockchain projects full-time. I'm most interested in any Python related tooling, Vyper, and Solidity.

A list of some projects I have officially audited:

  • OpenZeppelin 2.0
  • Decentraland Marketplace Contracts
  • dYdX
  • TrueUSD

A list of some projects I have contributed to:

  • Vyper
  • Langauge Vyper
top accounts reputation activity subscriptions
Top Questions
140 votes

When should I use calldata and when should I use memory?

solidity contract-development memory calldata keyword asked Aug 30, 2019 at 23:51
ethereum.stackexchange.com

51 votes

What are the virtual and override keywords in Solidity?

solidity override keyword solidity-0.6.0 virtual asked Dec 27, 2019 at 23:29
ethereum.stackexchange.com

32 votes

What is the difference between bytecode, init code, deployed bytecode, creation bytecode, and runtime bytecode?

bytecode initcode creationcode runtimecode deployed-bytecode asked Sep 29, 2019 at 16:31
ethereum.stackexchange.com

32 votes

What is the receive keyword in solidity?

solidity fallback-function solidity-0.6.0 keyword receive asked Mar 29, 2020 at 23:38
ethereum.stackexchange.com

30 votes

What is the difference between the constant and immutable keywords in Solidity?

solidity solidity-0.6.x constant keyword immutable asked Apr 8, 2020 at 0:24
ethereum.stackexchange.com

22 votes

What is the immutable keyword in Solidity?

solidity state-variable solidity-0.6.x keyword immutable asked Apr 7, 2020 at 14:32
ethereum.stackexchange.com

22 votes

Is it possible to perform a try-catch in Solidity?

solidity revert-opcode keyword solidity-0.6.0 try-catch asked Dec 27, 2019 at 22:45
ethereum.stackexchange.com

11 votes

How can I slice bytes, strings, and arrays in Solidity?

solidity arrays bytes solidity-0.6.0 slice asked Dec 27, 2019 at 21:42
ethereum.stackexchange.com

9 votes

How can I get the revert reason of a call in Solidity so that I can use it in the same on-chain transaction?

solidity contract-development transactions contract-design revert-opcode asked May 18, 2020 at 16:41
ethereum.stackexchange.com

7 votes

What is the history behind having peanuts in mission control during critical missions?

mars insight jpl asked Nov 26, 2018 at 20:17
space.stackexchange.com

1 2

Top Answers
171
When should I use calldata and when should I use memory?
ethereum.stackexchange.com

116
Elastic Search indexes gets deleted frequently
stackoverflow.com

64
What are the virtual and override keywords in Solidity?
ethereum.stackexchange.com

63
Cannot connect Heroku to custom Google Domain
stackoverflow.com

56
What is the receive keyword in solidity?
ethereum.stackexchange.com

54
What is the difference between bytecode, init code, deployed bytecode, creation bytecode, and runtime bytecode?
ethereum.stackexchange.com

33
Difference between Ganache and Truffle
ethereum.stackexchange.com

32
What is the difference between the constant and immutable keywords in Solidity?
ethereum.stackexchange.com

26
What is the immutable keyword in Solidity?
ethereum.stackexchange.com

23
Is it possible to perform a try-catch in Solidity?
ethereum.stackexchange.com

22
How can I slice bytes, strings, and arrays in Solidity?
ethereum.stackexchange.com

18
Setup Ganache with Metamask. What and where is a Chain ID?
ethereum.stackexchange.com

18
where is the privatekey and transation store in chrome file using metamask extension
stackoverflow.com

16
Is it possible to deploy a contract using create2 in Solidity?
ethereum.stackexchange.com

15
Execute transaction Approve directly against contract address (without ABI)
ethereum.stackexchange.com

13
Max/min values of standard data types
ethereum.stackexchange.com

10
Truffle test, how to get address(0)?
ethereum.stackexchange.com

10
Status of ABIEncoderV2 now
ethereum.stackexchange.com

9
How can I get the revert reason of a call in Solidity so that I can use it in the same on-chain transaction?
ethereum.stackexchange.com

8
What happens if you transfer ether and no miner is running?
ethereum.stackexchange.com

8
My friend sent me a screenshot of a transaction hash, but when I search for it I find divergent data. What happened?
ethereum.stackexchange.com

8
How to retrieve revert() reason for past transactions?
ethereum.stackexchange.com

8
How to get timestamp of an event log in emitted event from smart contract
ethereum.stackexchange.com

8
What's the vulnerability in my contract?
ethereum.stackexchange.com

7
Can I use an emoji as part of a string in Solidity?
ethereum.stackexchange.com

7
Getting a list of ERC20 token holders in solidity
stackoverflow.com

7
Etherscan api for Ropsten testnet
ethereum.stackexchange.com

7
Issue with New version of Metamask: Remix cannot detect the Metamask address
ethereum.stackexchange.com

7
How is it possible for 0x0000000000000000000000000000000000000000 to send out ERC-20 tokens?
ethereum.stackexchange.com

7
What is the purpose of extcodecopy?
ethereum.stackexchange.com

1 2