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: 577
Hash: 7b685d2bbbdf54342439a79cca6c70d807b802b3dc49260b8c5c7dbdc9c6a624
Previous block: 3410a7378f5b5aad714be9827a6257fddff8963930c134d502825ea3e61d1a9b
Next block: 5d37077f88f169bcb1b7ed60f2e62731c0249fd9ecf4798bd415e1d5b85d23e9
Weight: 948
Versionhex: 20000000
Version: 536870912
Time: 1564711425
Stripped size: 228
Size: 264
Nonce: 2
Merkle root: a11d4ebc4f9f0c55748424f3e3d3f31ab022bc75d267868cf22e5e21dcaa65af
Median time: 1564711424
Difficulty: 4.656542373906925e-10
Confirmations: 27
Chainwork: 0000000000000000000000000000000000000000000000000000000000000484
Bits: 207fffff