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Kronex blocks are sealed with kHeavyHash, ported from its reference implementation. The pre-image layout, the cSHAKE256 domain strings, the matrix generation including its float64 rank check, and the little-endian reading of the final hash all match the reference byte for byte. That is deliberate: existing kHeavyHash miners and stratum bridges stay compatible with Kronex work.

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The pre-image

PRE_POW_HASH is the seal hash the node selected for this work, handed out as index [0] of krnx_getWork. TIME is index [10]. The 64x64 matrix depends on the seal hash alone, so a miner generates it once per work package and then rolls only the nonce. The two form one immutable job: a miner may not roll TIME alongside the nonce. A different time is a different pre-image, which is work the node never issued.

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Two things that break integrations

TIME is in milliseconds, and it is not the block’s timestamp. Header.Time stays in seconds for the EVM, the difficulty controller and reward lockups. Index [10] is a separate value, already in milliseconds, and it goes into the pre-image exactly as received. Multiplying, dividing, or storing it in a uint32 changes the pre-image and every solution is rejected.
Share difficulty and consensus difficulty are different scales, exactly 2^32 apart. Take the value the pool hands the miner from the work package rather than converting network difficulty by hand.

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MixDigest must be zero

kHeavyHash needs no DAG and no cache, so there is no light/full verification split and nothing for a mix digest to carry. Consensus rejects any header whose MixDigest is non-zero, and krnx_submitWork expects a zero digest in its third argument.

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What the seal hash covers

The seal hash is an RLP hash over the usual header fields — parent hash, uncle hash, coinbase, state root, transaction and receipt roots, bloom, difficulty, number, gas limit, gas used, time, extra data, and the base fee when set. One Kronex-specific field joins them when it is set: KRNXAuxRoot, the root of the block’s merge-mining payload. Binding it into the pre-image rather than only into the block hash is what makes the payload expensive to rewrite — the payload decides who gets paid, and anything left out of the pre-image could be swapped after mining without invalidating the seal. Blocks that carry no merge-mining payload keep the stock pre-image, and stripping a payload zeroes the root, which drops the field and changes the hash just the same.

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Block time

The target is 10 seconds. Difficulty retargets toward it; see Difficulty.