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: 589
Hash: 3eeb687087af03d93db559f9e4487a806dd707d5a72aa214f858aaf7f777cdc2
Previous block: 5f81966e13ef02719511231edc2c904f4cfe8a11e37c45b0f8aa7fc00c0abbaa
Next block: 054ef2e4caf1f8cb71ce8b53e1f32f0fe99e5ac5892232b94508ba9a37102843
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711427
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: 0d92af67d75e2b9f8c9900c1278089b75f974c464b4aaa5e2f4e600a4b9c2d84
Median time: 1564711426
Difficulty: 4.656542373906925e-10
Confirmations: 15
Chainwork: 000000000000000000000000000000000000000000000000000000000000049c
Bits: 207fffff