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. mressCpnG

Height: 154
Hash: 4490bb17d9c6e0d1fd04b26bc8e73ba62f910cde1863aba45d7a68025303d666
Previous block: 1ea853419e02580f1c8b78eb534927a00457157b43e116c480188560df40247e
Next block: 524866b891c17e675b11e694e9ab7b4f7e07057feaa7765e2f9a503932c3180b
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074759
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: b04c14e0ca0ea3aee6ba37cf6be3dfe36b4470f3be38ef29645e777a8e363db9
Median time: 1544074758
Difficulty: 4.656542373906925e-10
Confirmations: 48
Chainwork: 0000000000000000000000000000000000000000000000000000000000000136
Bits: 207fffff