🧠 Crypto Brain Teaser The Vanishing Token Swap 🧠
Three NFT collectors enter a decentralized marketplace. Each contributes 10 ETH to mint a rare collection — total = 30 ETH.
But wait! Airdrop announcement: the smart contract only needed 24 ETH, not 30! So the contract refunds 6 ETH in total.
🤖 The automated system sends 1 ETH back to each collector (3 ETH total), and the remaining 3 ETH is accidentally locked in a “gas tip” pool (oops — thanks Ethereum fees!).
Let’s do the math:
Each collector effectively paid 10 - 1 = 9 ETH
Total paid: 3 × 9 = 27 ETH
The smart contract locked 3 ETH
So... 27 + 3 = 30 ETH — all accounted for?
But some say:
> 27 ETH paid + 3 ETH locked = 30 ETH… then where is the actual 24 ETH for the mint?
🔍 Spoiler: The trick is in how you're adding it.
The 3 ETH locked is already part of the 27 ETH paid — not something you add on top.
So here’s the real math:
24 ETH = cost of mint
3 ETH = locked tip
3 ETH = refunded to users
✔️ Total = 30 ETH
🎭 It's a math illusion — not a blockchain bug.
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