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: 591
Hash: 02bdd1cfc45c42292437e85002bf214d081602146ec9827bd60fbd23cd709b73
Previous block: 054ef2e4caf1f8cb71ce8b53e1f32f0fe99e5ac5892232b94508ba9a37102843
Next block: 5802eaea3c5b5e87181b205f1c0ff67f49eee235accabacfe9ca5889ded62823
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711427
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: ac81bc7aaaa983ae8186989d9157acc8052aa2396de514632a66ed0d896328a7
Median time: 1564711427
Difficulty: 4.656542373906925e-10
Confirmations: 13
Chainwork: 00000000000000000000000000000000000000000000000000000000000004a0
Bits: 207fffff