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bolt09: clarify that writers SHOULD/MUST set even/odd/no bits for assumed bits? #1307

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bolt09: clarify that writers SHOULD/MUST set even/odd/no bits for assumed bits? #1307

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bolt09: clarify what writers should do wrt assumed features
ekzyis Dec 12, 2025
b31c26e
bolt09: fix missing context for var_onion_optin?
ekzyis Dec 13, 2025
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8 changes: 6 additions & 2 deletions 09-features.md
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Original file line number Diff line number Diff line change
Expand Up @@ -36,7 +36,7 @@ The Context column decodes as follows:
| 0/1 | `option_data_loss_protect` | ASSUMED | | | |
| 4/5 | `option_upfront_shutdown_script` | Commits to a shutdown scriptpubkey when opening channel | IN | | [BOLT #2][bolt02-open] |
| 6/7 | `gossip_queries` | Peer has useful gossip to share | | | |
| 8/9 | `var_onion_optin` | ASSUMED | | | |
| 8/9 | `var_onion_optin` | ASSUMED | 9 | | |
| 10/11 | `gossip_queries_ex` | Gossip queries can include additional information | IN | | [BOLT #7][bolt07-query] |
| 12/13 | `option_static_remotekey` | ASSUMED | | | |
| 14/15 | `payment_secret` | ASSUMED | IN9 | | [Routing Onion Specification][bolt04] |
Expand Down Expand Up @@ -69,8 +69,12 @@ The origin node:
* MUST NOT set feature bits in fields not specified by the table above.
* MUST NOT set both the optional and mandatory bits.
* MUST set all transitive feature dependencies.
* MUST support:
* SHOULD require all `ASSUMED` features and therefore set their even bits:
* `option_data_loss_protect`
* `var_onion_optin`
* `option_static_remotekey`
* `payment_secret`
* `option_channel_type`

The receiving node:
* if both the optional and the mandatory feature bits in a pair are set,
Expand Down