go-ethereum/cmd/evm/testdata/19/readme.md

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## Difficulty calculation
This test shows how the `evm t8n` can be used to calculate the (ethash) difficulty, if none is provided by the caller,
this time on `GrayGlacier` (Eip 5133).
Calculating it (with an empty set of txs) using `GrayGlacier` rules (and no provided unclehash for the parent block):
```
[user@work evm]$ ./evm t8n --input.alloc=./testdata/19/alloc.json --input.txs=./testdata/19/txs.json --input.env=./testdata/19/env.json --output.result=stdout --state.fork=GrayGlacier
INFO [03-09|10:45:26.777] Trie dumping started root=6f0588..7f4bdc
INFO [03-09|10:45:26.777] Trie dumping complete accounts=2 elapsed="176.471µs"
INFO [03-09|10:45:26.777] Wrote file file=alloc.json
{
"result": {
"stateRoot": "0x6f058887ca01549716789c380ede95aecc510e6d1fdc4dbf67d053c7c07f4bdc",
"txRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
"receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
"logsHash": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
"logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"receipts": [],
"currentDifficulty": "0x2000000004000",
"gasUsed": "0x0",
"currentBaseFee": "0x500"
}
}
```