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: 586
Hash: 1310f0406327417f8308c71a78c78228964e6ad2e4afbc46cff41328f500606e
Previous block: 13220d6a83dc763f9101613724e180acce5394670bd2ab4be5c87bafd8ac65f5
Next block: 3d14d28efdf55807ac80d8681e4a4b796eb65eee2be14544acda13451893b8f5
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711427
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: bc7e9c8692d47d130436e32f5e36a9efcb56c4e78e84318560a6233995c07b0b
Median time: 1564711426
Difficulty: 4.656542373906925e-10
Confirmations: 18
Chainwork: 0000000000000000000000000000000000000000000000000000000000000496
Bits: 207fffff