When Was the Second Bitcoin Halving?

The second Bitcoin halving occurred on July 9, 2016, at 06:46:13 UTC. This pivotal event reduced the mining rewards for a Bitcoin block by half, going from 25 Bitcoins per block to 12.5 Bitcoins. The last block with the old reward of 25 Bitcoins was block number 419,999, while the first block with the new reward of 12.5 Bitcoins was block number 420,000.

The message Chandler Guo loves YangYang Jin is part of the coinbase message, which was included in the halving block. The miner embedded this message, most likely as a personal touch or a shout-out to someone special. It is common for miners to add such notes or statements in the coinbase transaction, especially in historically meaningful blocks.