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: 161
Hash: 5820d1a4ab30522188221177500a6a83a28e25cf15e443b6b5016839ac91289c
Previous block: 01ea4a80cc1d410d9f7c975fc41ec3a4dd6270cf8cba73d440cd5e15620ef1dc
Next block: 331c88b5ce6ddab3c7dab0460bcdfe9bade2388a2a51fa045526277d72ec8ab7
Weight: 912
Versionhex: 30000003
Version: 805306371
Time: 1544074760
Stripped size: 228
Size: 228
Nonce: 3
Merkle root: 1571c8d294e0395fb741cbe7eb51bffd3afb3182e52027337c1ffd5f45103734
Median time: 1544074759
Difficulty: 4.656542373906925e-10
Confirmations: 41
Chainwork: 0000000000000000000000000000000000000000000000000000000000000144
Bits: 207fffff