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: 1666
Hash: 51f7081ebab3574dcdeb1966428852d0533b978cd311a62cef30c005c0849fd9
Previous block: 782366dc90d04db9199f0b2e643fea9cb271323ec225993d220cfe0b3def44f8
Next block: 27507bd3ce0a328d8ab27f0ec749501e3d9a7aef24c1061fa193d80a10a24099
Weight: 908
Versionhex: 20000000
Version: 536870912
Transactions:
Time: 1719159201
Stripped size: 218
Size: 254
Nonce: 0
Merkle root: 516ea3c23c734d4bef58c486e34d1c800849795372ad7c8b4565b8f5668b1c36
Median time: 1719159200
Difficulty: 4.656542373906925e-10
Confirmations: 578
Chainwork: 0000000000000000000000000000000000000000000000000000000000000d06
Bits: 207fffff