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: 168
Hash: 723ad1bc2567a041bbc62a0b667bc1f23fbd8f005004093e78a87607cbec3e4b
Previous block: 5a00b8a580203b4cec7ae5b57497b3890f82554f7587b5e74b32442b693e5c67
Next block: 1027a261def9f27965788bf3167cbeb4c2bb961b846bbffef1647a0f1388af0b
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074761
Stripped size: 228
Size: 228
Nonce: 2
Merkle root: 5f50d68b8cf7b59d50f9d5bdf91c067a606c24968f577458cd3fa4ba3076c4d0
Median time: 1544074760
Difficulty: 4.656542373906925e-10
Confirmations: 34
Chainwork: 0000000000000000000000000000000000000000000000000000000000000152
Bits: 207fffff