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Clarify final cltv expiry computation in route blinding #1069

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Aug 11, 2023
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Clarify final cltv expiry computation in route blinding #1069

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9 changes: 6 additions & 3 deletions proposals/route-blinding.md
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Original file line number Diff line number Diff line change
Expand Up @@ -270,7 +270,7 @@ transmits the following information to the sender (most likely via an invoice):
* `fee_proportional_millionths`: 1001
* `htlc_minimum_msat`: 1000
* `cltv_expiry_delta`: 288
* `max_cltv_expiry`: 1200
* `max_cltv_expiry`: 1200 (may be conveyed via invoice expiration, assuming 10 minute blocks)
* `allowed_features`: empty
* Encrypted data for blinded nodes:
* `encrypted_payload(alice)`:
Expand Down Expand Up @@ -308,8 +308,11 @@ Erin uses the aggregated route relay parameters to compute how much should be se

* `amount = 100000 + 201 + (1001 * 100000 + 1000000 - 1) / 1000000 = 100302 msat`

Erin chooses a final expiry of 1100, which is below Alice's `max_cltv_expiry`, and computes the
expiry that should be sent to Carol:
Erin chooses a final expiry of 1100, which is below Alice's `max_cltv_expiry`. This value may be
chosen by adding a random cltv offset to the current block height as described in
[Recommendations for Routing](../07-routing-gossip.md#recommendations-for-routing).

Erin computes the expiry that should be sent to Carol:

* `expiry = 1100 + 288 = 1388`

Expand Down