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: 578
Hash: 5d37077f88f169bcb1b7ed60f2e62731c0249fd9ecf4798bd415e1d5b85d23e9
Previous block: 7b685d2bbbdf54342439a79cca6c70d807b802b3dc49260b8c5c7dbdc9c6a624
Next block: 7ceee3f634edf9c17af5958bd019e90e6c77db4502d479dc0c02f5086f9a6da6
Weight: 948
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1564711425
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: df4c2d46cc3e67e05beedb4d8f80a07f7cf967e2c1f7e4c57bbaa3a64583418d
Median time: 1564711424
Difficulty: 4.656542373906925e-10
Confirmations: 26
Chainwork: 0000000000000000000000000000000000000000000000000000000000000486
Bits: 207fffff