The user wants a Binance Square post with specific requirements. Let me break them down:

1. Start with "Did you know?"
2. 100-140 words total
3. No markdown
4. Expand the fact with 2-3 interesting context sentences
5. End with a surprised reaction emoji (written out as text like "Mind blown!") and a question
6. Final line must be exactly: #LINK #Avalanche #CryptoFact #LearnCrypto

The fact: "Every 4 years, the Bitcoin block reward halves — this is called the halving"

I need to write 100-140 words. Let me draft:

"Did you know? Every four years, the Bitcoin block reward halves — this is called the halving. Satoshi Nakamoto programmed this scarcity mechanism directly into Bitcoin's code to mimic gold's finite supply. The first halving in 2012 cut rewards from 50 to 25 BTC, the second in 2016 dropped it to 12.5, and the third in 2020 brought it to 6.25. The most recent halving in April 2024 reduced miner rewards to just 3.125 BTC per block. Each event historically preceded major bull runs as reduced supply met growing demand. Mind blown! Which halving cycle do you