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: 180
Hash: 71c08f98ecf07ac72993974f5dcceaca3ae39d8f499e6d94b8d98425f0038d7c
Previous block: 27e26be7a7b5c07d693a37d6743e789378f4e99d5694aa29a6ea4c40c23c723d
Next block: 220e0365e5f4a12645bad0e44d2c0e6cbe179f445e9c40720c45504582a58ee1
Weight: 912
Versionhex: 30000003
Version: 805306371
Transactions:
Time: 1544074763
Stripped size: 228
Size: 228
Nonce: 2
Merkle root: 3b598abf38e0a317bff52f2811a1c8cfe8f7f96c8e67f19e194339d65cd99269
Median time: 1544074762
Difficulty: 4.656542373906925e-10
Confirmations: 22
Chainwork: 000000000000000000000000000000000000000000000000000000000000016a
Bits: 207fffff