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: 596
Hash: 517104ad64b752cf4724268efe6e042722f55712895dd9406a3a4509ec641d7c
Previous block: 652b2676a8b515c34d32eb3667253e15116b7a61910b25fb3091eb0533fde2f3
Next block: 3510ca7f0c5d35a60a374585f709e904bf650327f78faa1df1c02fb314595e4c
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711428
Stripped size: 228
Size: 264
Nonce: 4
Merkle root: 91334393ccfa8b61d6351dd73033b45f10133b2368a55e582abbadd878e69318
Median time: 1564711427
Difficulty: 4.656542373906925e-10
Confirmations: 8
Chainwork: 00000000000000000000000000000000000000000000000000000000000004aa
Bits: 207fffff