As part of Bitcoin's coin issuance, miners are rewarded a certain amount of bitcoins whenever a block is produced (approximately every 10 minutes). When Bitcoin first started, 50 Bitcoins per block were given as a reward to miners. After every 210,000 blocks re mined ("Bitcoin Halving" - aapproximately every 4 years), the block reward halves and will keep on halving until the block reward per block becomes 0 (approximately by year 2140).
The next Bitcoin halving date is scheduled to take place at block 840,000.
This market will resolve to YES, if Bitcoin block #840,000 is mined before April 24, 12 AM ET. Otherwise, it will resolve to NO.
As of now, the block reward is 6.25 coins per block and will decrease to 3.125 BTC per block post-halving.
Watch the current block and new blocks being mined at https://timechaincalendar.com/en or http://mempool.space