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: 582
Hash: 28428158c8d6915e128c510a5b12cbc5d801b91433a8126ed5e1198736b20de8
Previous block: 05f40d7470e1b6a7bc699a5e6d5b39796c23f211b59461793a7c05f75f52d2de
Next block: 3f282cbd22be3b084999dca13615fd6c1373bdd709561b59ff26aa3bd3100e1d
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711426
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: d8532120a70b7e3da828067d27757435203b810822c506a36f2c0548c552d20f
Median time: 1564711425
Difficulty: 4.656542373906925e-10
Confirmations: 22
Chainwork: 000000000000000000000000000000000000000000000000000000000000048e
Bits: 207fffff