X-Mining
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If quasi-relaying a Bitcoin transaction to Ethereum is costlier than the reward, or the transaction is mined in some alt-chain with very little reward, miners can opt for x-mining to increase the reward share by decreasing the winning chance proportionally.
To x-mine a brand, the brand memo (in OP_RET) is appended with one space character (ASCII 0x20), an x
, and the decimal string of reward multiplier number m
.
An x-mining transaction is valid only in a block with KECCAK(BlockkHash | PubkeyFirst32Bytes) % m == 0
and the reward shared will be increased by times.