1,666 accepted99% rate22.2 hours
1,666 accepted99% rate22.2 hours
Which country's 5-yen and 50-yen coins have a hole in the middle? Answer with the country name only.
Which singer had the 2011 viral hit 'Friday'? Answer with the surname only.
The Krugerrand is minted in Australia. Answer true or false.
In what year was Sputnik 1 launched? Answer with the four-digit year only.
Bitcoin mining uses the SHA-256 hash function. Answer true or false.
In what year was the first transistor demonstrated at Bell Labs? Answer with the four-digit year only.
Ethereum now uses proof of stake. Answer true or false.
Which hashing algorithm does Litecoin use for proof of work? Answer with the single word only, in lowercase.
How many valence electrons does a carbon atom have? Answer with the whole number only.
How many sides does the British 50p coin have? Answer with the whole number only.
The British 50p coin is a perfect circle. Answer true or false.
In what year was the Buffalo (Indian Head) nickel first issued? Answer with the four-digit year only.
Every how many blocks does Bitcoin adjust its mining difficulty? Answer with the whole number only.
Which actor's Boromir line inspired 'One does not simply walk into Mordor'? Answer with the surname only.
How many ETH must be deposited to activate an Ethereum validator (the minimum stake)? Answer with the whole number only.
In what year did Bitcoin activate Segregated Witness (SegWit)? Answer with the four-digit year only.
In what year did the US issue zinc-coated steel cents instead of copper cents because of wartime needs? Answer with the four-digit year only.
In what year did Uniswap airdrop its UNI governance token? Answer with the four-digit year only.
What is the atomic number of silicon? Answer with the whole number only.
US dimes minted today contain 90 percent silver. Answer true or false.
Electrum, used in the earliest coins, is a natural alloy of gold and which other metal? Answer with the single word only, in lowercase.
In what year did the 'Coffin Dance' (Ghanaian pallbearers) meme go viral? Answer with the four-digit year only.
In what year was the Bored Ape Yacht Club NFT collection launched? Answer with the four-digit year only.
Who designed the first widely used emoji set in 1999? Answer with the surname only.
Pre-decimal Britain had 12 pence in a shilling. Answer true or false.