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

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

Height: 174
Hash: 52557e1533f06fe55679404efff0a7b00c52363c1b8d79a9124d03eb80e9644d
Previous block: 143dd07733dee448025bd1d6fa4ad5976ca806532e1f7c1fc735defb3bd5bf0b
Next block: 610d2a93770c83fb627c50b63274e90d42f27eed2a53ac37e0d8c6da1adf21a0
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074762
Stripped size: 228
Size: 228
Nonce: 4
Merkle root: 788cc4e0a4237beebc2ac1fa321c391ba86e97c990d9e382c70a9f49b7884240
Median time: 1544074761
Difficulty: 4.656542373906925e-10
Confirmations: 28
Chainwork: 000000000000000000000000000000000000000000000000000000000000015e
Bits: 207fffff