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: 152
Hash: 5e86091d53fbcdad9521d0df117c399d4cfbad144355d8be3b82639a333d0844
Previous block: 08b73bc8a534127c3c035b1fbdd4d8a409ac0b0050f09c0bbe0b2e0e3b6e0b12
Next block: 1ea853419e02580f1c8b78eb534927a00457157b43e116c480188560df40247e
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074759
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: e773bb0bce9332680ed8884e14b64c4e33d7dbb2fc1a69dc577b62764a41dd52
Median time: 1544074758
Difficulty: 4.656542373906925e-10
Confirmations: 50
Chainwork: 0000000000000000000000000000000000000000000000000000000000000132
Bits: 207fffff