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.

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

Height: 1520
Hash: 5e5f50d28b69664382effb6c927a3b89a544d3548476950bc38cb596831b63da
Previous block: 6a6cfb48b545c96983685a44b61ffc8511fb6048a11f04753b04c3ee47b51ad1
Next block: 3a40b138ef3200b6d4635bea3d7616596e62ca35f772918f6b371b7a838fbe87
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1718697661
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: d832a2950dbdc1b14da883b5688e3a2af547d3ae743acf70e6f9c11e13b0d9b7
Median time: 1718697660
Difficulty: 4.656542373906925e-10
Confirmations: 724
Chainwork: 0000000000000000000000000000000000000000000000000000000000000be2
Bits: 207fffff