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 github.com/pdxrod/blockchain_explorer.

home    blocks

Enter a block height, e.g. 123, or the start of a bitcoin address, e.g. mgqFp9Dhy

Height: 2163
Hash: 648d7c0b8edb2a2c8c27c20c618d499fb1beb5ac22cbacba9fa12da34678c95e
Previous block: 1798b0e17a59017fd10b1b36b4564a4cf8d00581c41484b4b69110a6f45ac4f2
Next block: 0017011954e859016bbcecce7b0958a19b9be5cc8acdb66efc5fe907654eeb1a
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1728964797
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 89eb82ff8247a0e3f72bc55a4acb85a4af4b11779a97259fea9b2adef3f9bea1
Median time: 1728964796
Difficulty: 4.656542373906925e-10
Confirmations: 81
Chainwork: 00000000000000000000000000000000000000000000000000000000000010e8
Bits: 207fffff