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: 588
Hash: 5f81966e13ef02719511231edc2c904f4cfe8a11e37c45b0f8aa7fc00c0abbaa
Previous block: 3d14d28efdf55807ac80d8681e4a4b796eb65eee2be14544acda13451893b8f5
Next block: 3eeb687087af03d93db559f9e4487a806dd707d5a72aa214f858aaf7f777cdc2
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711427
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: 7106b05b2b8b9e0f1d7130b6662a6b2cb9ca705ac6f9da5bd29ce385bb84c8d8
Median time: 1564711426
Difficulty: 4.656542373906925e-10
Confirmations: 16
Chainwork: 000000000000000000000000000000000000000000000000000000000000049a
Bits: 207fffff