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: 584
Hash: 09d7a0ca89f5b529f79faf96cfcc03203140ea864e409ad82aee9bc126c5bdde
Previous block: 3f282cbd22be3b084999dca13615fd6c1373bdd709561b59ff26aa3bd3100e1d
Next block: 13220d6a83dc763f9101613724e180acce5394670bd2ab4be5c87bafd8ac65f5
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711426
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: bffa5c0142e2043863138e83b8feeb170cbe5d7164cd6c561e66861413574894
Median time: 1564711425
Difficulty: 4.656542373906925e-10
Confirmations: 20
Chainwork: 0000000000000000000000000000000000000000000000000000000000000492
Bits: 207fffff