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BOLT 12: clarify that offer_amount must be greater than zero #1316

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BOLT 12: clarify that offer_amount must be greater than zero #1316

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3 changes: 3 additions & 0 deletions 12-offer-encoding.md
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Original file line number Diff line number Diff line change
Expand Up @@ -240,6 +240,7 @@ A writer of an offer:
- SHOULD omit `offer_chains`, implying that bitcoin is only chain.
- if a specific minimum `offer_amount` is required for successful payment:
- MUST set `offer_amount` to the amount expected (per item).
- MUST set `offer_amount` greater than zero.
- if the currency for `offer_amount` is that of all entries in `chains`:
- MUST specify `offer_amount` in multiples of the minimum lightning-payable unit
(e.g. milli-satoshis for bitcoin).
Expand Down Expand Up @@ -299,6 +300,8 @@ A reader of an offer:
- MUST NOT respond to the offer
- if `offer_amount` is set and `offer_description` is not set:
- MUST NOT respond to the offer.
- if `offer_amount` is set and is not greater than zero:
- MUST NOT respond to the offer.
- if `offer_currency` is set and `offer_amount` is not set:
- MUST NOT respond to the offer.
- if neither `offer_issuer_id` nor `offer_paths` are set:
Expand Down