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: 556
Hash: 01fd5c603c4d971388e7bbbe88f87d27eb8bd30cb02ae913dbb300e4b4e85445
Previous block: 25f7c642c7d4b02f8f4f8611074ac1e28892b911eb2e8297631a96324afc4259
Next block: 32d94fd3dfa502d53f303fa0e2a65efd0a0f41a64d98eb91857017bd8d7debde
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711422
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: 14466a64f1f66a7141e93ab45bb686157b3a8d05502884cefe3b4987c8ed29c7
Median time: 1564711421
Difficulty: 4.656542373906925e-10
Confirmations: 48
Chainwork: 000000000000000000000000000000000000000000000000000000000000045a
Bits: 207fffff