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. mxMfLjAez

Height: 1722
Hash: 5e40602f84941f71650cce77c99feb236e7a6292f8d5d6afef45f524221c958c
Previous block: 2878f7f09ea9d6b918247c43daacf60fe7fe7034ed2b86298243039042503d28
Next block: 7066f43ab02ee95321c67f02d323692cd053cfa210f14ac9ff522dac6ecc6191
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1719159210
Stripped size: 218
Size: 254
Nonce: 1
Merkle root: 2ae7dccfff38467bb4282a0a6709bdf6051aee0175bcbdf1e90df2e46b4800c0
Median time: 1719159209
Difficulty: 4.656542373906925e-10
Confirmations: 522
Chainwork: 0000000000000000000000000000000000000000000000000000000000000d76
Bits: 207fffff