Per-hop blinding just means that you have inbound value R1 and outbound value R2=R1+kG, where k is a per-hop constant known only to you and the person initiating the payment, so when you receive/calculate r2 on your outbound link, you can calculate r1=r2-k to claim the inbound funds. You just need to relate r1/R1 (and r2/R2) on-chain, you don’t need to relate r1/r2 or R1/R2 on-chain (which would remove the privacy benefit anyway).
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