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. mzaGu

Height: 594
Hash: 67502a5b3a7e09d062d06194b68bbda8c798598b5a855a5f37173506507f9789
Previous block: 0ae0cf030fbe39e44a0e2b7a7188f1f4005b45890119b024d60cfee3ab035789
Next block: 652b2676a8b515c34d32eb3667253e15116b7a61910b25fb3091eb0533fde2f3
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711428
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: a742373f59db085ff407dda10f9b6b47114833c6abe26d81504383eaf25b1d31
Median time: 1564711427
Difficulty: 4.656542373906925e-10
Confirmations: 10
Chainwork: 00000000000000000000000000000000000000000000000000000000000004a6
Bits: 207fffff