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Make s field mandatory in invoices

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t-bast 2021-08-10 17:22:23 +02:00
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11-payment-encoding.md
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@ -159,7 +159,7 @@ Currently defined tagged fields are:
A writer:
- MUST include exactly one `p` field.
- If the `payment_secret` feature is set, MUST include exactly one `s` field.
- MUST include exactly one `s` field.
- MUST set `payment_hash` to the SHA2 256-bit hash of the `payment_preimage`
that will be given in return for payment.
- MUST include either exactly one `d` or exactly one `h` field.
@ -293,19 +293,11 @@ The field is big-endian. The least-significant bit is numbered 0,
which is _even_, and the next most significant bit is numbered 1,
which is _odd_.
Note that the `payment_secret` feature prevents probing attacks from nodes
along the path, but only if made compulsory: yet doing so will break
older clients which do not understand the feature. It is compulsory
for `basic_mpp` however, as that is also a recent feature, and makes
nodes more vulnerable to probing attacks as there is no lower-bound
on the amount sent.
### Requirements
A writer:
- MUST set the `9` field to a feature vector compliant with the
[BOLT 9 origin node requirements](09-features.md#requirements).
- MUST set an `s` field if and only if the `payment_secret` feature is set.
A reader:
- if the feature vector does not set all known, transitive feature dependencies: