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: 188
Hash: 20fa13640bd0723d9da301ee5c091e3ffb88d77186d15c90377997af01375dde
Previous block: 57ff004db079c35cb5ee914d130d7face148a8b93e910cd842b590b0ccc26bde
Next block: 25249fa9f1d59a4d92c355e0013d6792ba1bf4b1fa36bdb5ca40f5a81b3d4ef1
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074765
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: dc6051fce7d2edcd34472bfa3373ccd9eedc8721c4757167674afa6b2b101d1b
Median time: 1544074764
Difficulty: 4.656542373906925e-10
Confirmations: 14
Chainwork: 000000000000000000000000000000000000000000000000000000000000017a
Bits: 207fffff