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