Power Block Example

Using Blockstream look up block 668743 https://blockstream.info/block/00000000000000000000111118b936003a81e523ac22888f4d51d5fa0e7c8d52

Block 668743 is a Power Block because the block hash contains "1111"

00000000000000000000111118b936003a81e523ac22888f4d51d5fa0e7c8d52