The explorer is running in 'regtest' mode. This saves disk space, but there is limited data.
The code for this application can be found at github.com/pdxrod/blockchain_explorer.

home    blocks

Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mkrgsKuFE

Height: 191
Hash: 7ab664df17e13564256bb4fc886207b806dc6a96e60a7ad708febb5c6ac05ac0
Previous block: 32eb8a28c1a4cf1cd3c624485fd90cc7134825cafc7569cca030267ef5ef2955
Next block: 55a75137721698c3a803564162abf1c192576e45ed469ce84ea50d89270acea0
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074765
Stripped size: 228
Size: 228
Nonce: 1
Merkle root: cf9cd3fc1f9a851590a61692e20fe8d6efc6a6ba418ddb41b18e21916f55b158
Median time: 1544074764
Difficulty: 4.656542373906925e-10
Confirmations: 11
Chainwork: 0000000000000000000000000000000000000000000000000000000000000180
Bits: 207fffff