Debunking a Deceitful BCH Claim

The Claim

Because of the hash ratio between BTC and BCH, and the difficulty adjustments that maintain an equilibrium, it is the entire set of SHA-256 mining (including BTC mining) that bears the cost under this plan.

Assuming a Static Global Hash Rate

This is counterintuitive: With 12.5% of the coinbase being donated, then on first glance, it would appear that BCH miners simply give up 12.5% of their rewards and would then lose 12.5% of their hash as well.However, after difficulty adjusts on BTC, it is a different story.

Assume round numbers for illustration: BTC is 97% hash and BCH 3%.If BCH gives up 12.5% of its reward, that 3% goes to about 2.6%, and BTC would go to 97.4%.

0.375% of the total SHA-256 rewards are being pulled out of the entire system, but this cost will be split between BTC and BCH in the same ratio as the hash (97:3).The BCH hashrate will be diminished by 12.5%, but BTC mining will bear 97% of the cost of the diminished profitability, because there will be more hash competing for the same BTC rewards.

First Order Effects

Second and Third-order Effects

First-order Security Costs




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