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.

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Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mkrgsKuFE

Height: 179
Hash: 27e26be7a7b5c07d693a37d6743e789378f4e99d5694aa29a6ea4c40c23c723d
Previous block: 333366dde8d264e55a636dadb7f221ded59e384f5f6b64f0f3fb158a37859a07
Next block: 71c08f98ecf07ac72993974f5dcceaca3ae39d8f499e6d94b8d98425f0038d7c
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074763
Stripped size: 228
Size: 228
Nonce: 1
Merkle root: 70d986b0f3087ea0f0cbf828e1dc75d7f4890e7e6dfdb5843da17351d0e572e4
Median time: 1544074762
Difficulty: 4.656542373906925e-10
Confirmations: 23
Chainwork: 0000000000000000000000000000000000000000000000000000000000000168
Bits: 207fffff