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: 552
Hash: 2df867158147239be63e12a253d43309b57edbe0413ce3e93ed7cdfa6a214c12
Previous block: 0ea99a4120b526d23b05a8d8690a2eb2fb9e50e3de1a2a65c3b3bead0a1d1b91
Next block: 73512f19508f3ff55c518b21d297d6b75bf814349d91f733b03f629f37bef0db
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711421
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: 8f14d6ac23afed8822a2d1270e7c99ff0eae3d2bf026f8ac34419a30212d8f2d
Median time: 1564711420
Difficulty: 4.656542373906925e-10
Confirmations: 52
Chainwork: 0000000000000000000000000000000000000000000000000000000000000452
Bits: 207fffff