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: 580
Hash: 322b388883853ad04770793905ea782dab76c6f73e57bfb3e4cd44639a0ac06d
Previous block: 7ceee3f634edf9c17af5958bd019e90e6c77db4502d479dc0c02f5086f9a6da6
Next block: 05f40d7470e1b6a7bc699a5e6d5b39796c23f211b59461793a7c05f75f52d2de
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711426
Stripped size: 228
Size: 264
Nonce: 0
Merkle root: c3fe00509d4d2781feb78b1f910d5ab8d1898a7261237f598bdd6583b0225c3a
Median time: 1564711425
Difficulty: 4.656542373906925e-10
Confirmations: 24
Chainwork: 000000000000000000000000000000000000000000000000000000000000048a
Bits: 207fffff