Proof-of-Work Chains - Wiki Parity Ethereum Documentation

Here is an example chain specification file for a public/open Proof-of-Work (Ethash) chain. To start Parity with a JSON file specifying the chain, run $ parity --chain path/to/chain/spec.json, or create a config file:

[parity]
chain = "path/to/chain/spec.json"

This a basic Morden config with a few parameters changed:

{
	"name": "Morden",
	"engine": {
		"Ethash": {
			"params": {
				"gasLimitBoundDivisor": "0x0400",
				"minimumDifficulty": "0x020000",
				"difficultyBoundDivisor": "0x0800",
				"durationLimit": "0x0a",
				"blockReward": "0x4563918244F40000",
				"registrar": "",
				"homesteadTransition": "0x0"
			}
		}
	},
	"params": {
		"accountStartNonce": "0x0100000",
		"maximumExtraDataSize": "0x20",
		"minGasLimit": "0x1388",
		"networkID" : "0x42"
	},
	"genesis": {
		"seal": {
			"ethereum": {
				"nonce": "0x00006d6f7264656e",
				"mixHash": "0x00000000000000000000000000000000000000647572616c65787365646c6578"
			}
		},
		"difficulty": "0x20000",
		"author": "0x0000000000000000000000000000000000000000",
		"timestamp": "0x00",
		"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
		"extraData": "0x",
		"gasLimit": "0x2fefd8"
	},
	"nodes": [
		"enode://c2328c3e7857106585dbb59b712ac2ab9443d4f0b55b77451fbf33c0dda58b882[email protected]192.168.0.12:30303"
	],
	"accounts": {
		"0000000000000000000000000000000000000001": { "balance": "1", "nonce": "1048576", "builtin": { "name": "ecrecover", "pricing": { "linear": { "base": 3000, "word": 0 } } } },
		"0000000000000000000000000000000000000002": { "balance": "1", "nonce": "1048576", "builtin": { "name": "sha256", "pricing": { "linear": { "base": 60, "word": 12 } } } },
		"0000000000000000000000000000000000000003": { "balance": "1", "nonce": "1048576", "builtin": { "name": "ripemd160", "pricing": { "linear": { "base": 600, "word": 120 } } } },
		"0000000000000000000000000000000000000004": { "balance": "1", "nonce": "1048576", "builtin": { "name": "identity", "pricing": { "linear": { "base": 15, "word": 3 } } } },
		"16a9dfd266e3229f05a2704c13bf2e16ea23e7c3": { "balance": "1606938044258990275541962092341162602522202993782792835301376", "nonce": "1048576" }
	}
}