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: 189
Hash: 25249fa9f1d59a4d92c355e0013d6792ba1bf4b1fa36bdb5ca40f5a81b3d4ef1
Previous block: 20fa13640bd0723d9da301ee5c091e3ffb88d77186d15c90377997af01375dde
Next block: 32eb8a28c1a4cf1cd3c624485fd90cc7134825cafc7569cca030267ef5ef2955
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074765
Stripped size: 228
Size: 228
Nonce: 0
Merkle root: cafd5a262ac9e14c0ec9a06ac8613c0d144c80cacf890127c1ca453a31ab6474
Median time: 1544074764
Difficulty: 4.656542373906925e-10
Confirmations: 13
Chainwork: 000000000000000000000000000000000000000000000000000000000000017c
Bits: 207fffff