Test Your OG Knowledge - Answers & Fun Facts

Thanks for taking the Test Your OG Knowledge quiz! 🧠💎
Here are the correct answers along with a bit of history behind each one. So whether you nailed them all or learned something new, you’ll walk away with a few more Ethereum trivia points (and hopefully some Etherscan Points too).

1. When did Etherscan officially launch?

✅ 12 August, 2015

Etherscan went live on 12 August 2015, becoming one of the earliest and longest-running independent projects built around Ethereum and its community, with the mission of providing equitable access to blockchain data.

2. Which early Etherscan-verified contract includes a read function that returns “Hello Ethereum!”?

✅ 0xa3483b08C8A0F33eB07afF3A66fbcaf5C9018CDC

This simple contract holds a single read function that returns the phrase “Hello Ethereum!”, and is one of the earliest verified contracts on Etherscan.

3. What was the gas limit for the first 10,000 Ethereum blocks?

✅ 5,000 gas

At launch, Ethereum’s first 10,000 blocks had a hardcoded gas limit of 5,000 as part of a short “thawing” period. This prevented most transactions for the first few days, giving miners time to start up and early adopters to set up their clients before the limit was raised.

4. What did devops199 write after freezing over 500k ETH in Parity’s multisig wallets?

✅ I accidentally killed it

In November 2017, a user known as devops199 unintentionally triggered a bug in Parity’s multisig wallet contract, freezing over 500,000 ETH, and famously posted this short message.

5. Which of these ICOs sold out the fastest?

✅ Basic Attention Token (BAT)

BAT’s 2017 ICO sold out in under 30 seconds, from block 3798640 - 3798642, raising $35 million almost instantly. Its speed became a hallmark of the ICO boom, sparking debates about fairness and accessibility in token sales.