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BOLT 4: allow more overpaying.

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The idea of the "SHOULD fail if amount is too much" was courtesy against
overpaying, but that's a bad idea of you value privacy and some vendor has
well-known prices.  Allow a factor of two, at least.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Rusty Russell 2017-03-29 15:49:12 +10:30
parent ed107e4ef0
commit 6b80a9f258
1 changed files with 4 additions and 2 deletions
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04-onion-routing.md
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@ -592,8 +592,10 @@ If the payment hash is unknown, the final node MUST fail the HTLC:
1. type: PERM|15 (`unknown_payment_hash`)
If the amount paid is less than the amount expected, the final node
MUST fail the HTLC. If the amount paid is more than the amount
expected, the final node SHOULD fail the HTLC:
MUST fail the HTLC. If the amount paid is more than twice the amount
expected, the final node SHOULD fail the HTLC. This allows the sender
to reduce information leakage by altering the amount, without allowing
accidental gross overpayment:
1. type: PERM|16 (`incorrect_payment_amount`)