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: 554
Hash: 798391bcd225055eb1310c7d8c3991b1c252e68e86e1df270098bdf53b193dfd
Previous block: 73512f19508f3ff55c518b21d297d6b75bf814349d91f733b03f629f37bef0db
Next block: 25f7c642c7d4b02f8f4f8611074ac1e28892b911eb2e8297631a96324afc4259
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711421
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: 9b45c04db00eebd81bbf86d3ff60bcdd0feb2d0bae128aa8e1d7dd9ee9d83ea2
Median time: 1564711420
Difficulty: 4.656542373906925e-10
Confirmations: 50
Chainwork: 0000000000000000000000000000000000000000000000000000000000000456
Bits: 207fffff