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: 583
Hash: 3f282cbd22be3b084999dca13615fd6c1373bdd709561b59ff26aa3bd3100e1d
Previous block: 28428158c8d6915e128c510a5b12cbc5d801b91433a8126ed5e1198736b20de8
Next block: 09d7a0ca89f5b529f79faf96cfcc03203140ea864e409ad82aee9bc126c5bdde
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711426
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: 6b72aa45a76aa05a8d9fff095668c4b8be335560b2c72f90c1c5e6203d8e8feb
Median time: 1564711425
Difficulty: 4.656542373906925e-10
Confirmations: 21
Chainwork: 0000000000000000000000000000000000000000000000000000000000000490
Bits: 207fffff