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: 558
Hash: 6665a530ab60e4d159367b7733949473ceefea9ca8f0d38da3f3ad1f821b2d04
Previous block: 32d94fd3dfa502d53f303fa0e2a65efd0a0f41a64d98eb91857017bd8d7debde
Next block: 44831f74f62aae6eb772eb7448b00af6734dc1f1fab1fd6d38fc692cda003552
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711422
Stripped size: 228
Size: 264
Nonce: 1
Merkle root: ad3ac1f3051405e6bcd7204f2e1e71fd3d0b52bdfe4d0a4f85dad81aa8064697
Median time: 1564711421
Difficulty: 4.656542373906925e-10
Confirmations: 46
Chainwork: 000000000000000000000000000000000000000000000000000000000000045e
Bits: 207fffff