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: 590
Hash: 054ef2e4caf1f8cb71ce8b53e1f32f0fe99e5ac5892232b94508ba9a37102843
Previous block: 3eeb687087af03d93db559f9e4487a806dd707d5a72aa214f858aaf7f777cdc2
Next block: 02bdd1cfc45c42292437e85002bf214d081602146ec9827bd60fbd23cd709b73
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711427
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: cb2a12133c850093a02b5739d26ee02390dc6e10ea613155fcd36e04e3a4f755
Median time: 1564711426
Difficulty: 4.656542373906925e-10
Confirmations: 14
Chainwork: 000000000000000000000000000000000000000000000000000000000000049e
Bits: 207fffff