---
title: "Test Your OG Knowledge - Answers & Fun Facts"
description: "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)."
url: https://info.etherscan.com/test-your-og-knowledge-answers-fun-facts/
tags: ["General"]
published: 2025-08-14
updated: 2026-06-21
---

# Test Your OG Knowledge - Answers & Fun Facts

![](https://info.etherscan.com/test-your-og-knowledge-answers-fun-facts/images/2025/08/image-20.png)

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**

> GM explorooors!  
>   
> On which day will we be celebrating Etherscan’s 10th anniversary? 👀  
>   
> [#10YearsofEtherscan](https://twitter.com/hashtag/10YearsofEtherscan?src=hash&ref_src=twsrc%5Etfw)
> 
> — etherscan.eth (@etherscan) [August 10, 2025](https://twitter.com/etherscan/status/1954514403250073986?ref_src=twsrc%5Etfw)

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**

> The first smart contract on Ethereum was deployed the same day as the network's very first transaction  
>   
> And the earliest Etherscan-verified contract contains a single read function that returns "Hello Ethereum!"[https://t.co/kSGQE62vsx](https://t.co/kSGQE62vsx) [pic.twitter.com/DiALGlDkVu](https://t.co/DiALGlDkVu)
> 
> — etherscan.eth (@etherscan) [August 7, 2025](https://twitter.com/etherscan/status/1953448860564541812?ref_src=twsrc%5Etfw)

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**

![](https://info.etherscan.com/test-your-og-knowledge-answers-fun-facts/images/2025/08/image-15.png)

Source: [https://etherscan.io/block/10000](https://etherscan.io/block/10000)

At launch, Ethereum’s first 10,000 blocks had a hardcoded gas limit of 5,000 as part of a short “[thawing](https://blog.ethereum.org/2015/07/22/frontier-is-coming-what-to-expect-and-how-to-prepare#initial-thawing-gas-limits-during-the-first-few-days)” 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**

> I accidentally killed it.[https://t.co/5aAgksvKgH](https://t.co/5aAgksvKgH)
> 
> — devops199 (@devops199) [November 7, 2017](https://twitter.com/devops199/status/927912053297303552?ref_src=twsrc%5Etfw)

In November 2017, a user known as _devops199_ unintentionally [triggered a bug](https://www.theguardian.com/technology/2017/nov/08/cryptocurrency-300m-dollars-stolen-bug-ether) 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)**

![](https://info.etherscan.com/test-your-og-knowledge-answers-fun-facts/images/2025/08/image-18.png)

BAT’s 2017 ICO sold out in [under 30 seconds](https://www.coindesk.com/markets/2017/05/31/35-million-in-30-seconds-token-sale-for-internet-browser-brave-sells-out), from block [3798640](https://etherscan.io/advanced-filter?fadd=0x0d8775f648430679a709e98d2b0cb6250d2887ef&tadd=0x0d8775f648430679a709e98d2b0cb6250d2887ef&sort=asc&p=46) - [3798642](https://etherscan.io/advanced-filter?fadd=0x0d8775f648430679a709e98d2b0cb6250d2887ef&tadd=0x0d8775f648430679a709e98d2b0cb6250d2887ef&sort=asc&p=54), raising $35 million almost instantly. Its speed became a hallmark of the ICO boom, sparking debates about fairness and accessibility in token sales.