C-Lightning-Modifications.md

+hsmd_wire.csv:
+----------------------------------------------------------------
+* We add new HSMD messages:
+  - `hsmd_new_channel`
+  - `hsmd_ready_channel`
+  - `hsmd_validate_commitment_tx`
+  - `hsmd_validate_revocation`
+<br>
+* We add fields to existing HSMD messages:
+  - `hsmd_sign_commitment_tx`, `hsmd_sign_remote_commitment_tx`:
+    - `commit_num`
+    - `simple_htlc` [vector]
+    - `feerate`
+<br>
+The `simple_htlc` struct is:
+```
+struct simple_htlc {
+	enum side side;
+	struct amount_msat amount;
+	struct sha256 payment_hash;
+	u32 cltv_expiry;
+};
+```
+<br>
+* We add wallet index metadata to existing messages (fill in existing PSBT fields):
+
+  - Added fields to `channeld_wire.csv`:`channeld_init`:
+    * `final_index`
+    * `final_ext_key`
+<br>
+  - Added fields to `channeld_wire.csv`:`channeld_send_shutdown`:
+    * `final_index`
+    * `final_ext_key`
+<br>
+  - Added fields to `onchaind_wire.csv`:`onchaind_init`:
+    * `ourwallet_index`
+    *  `ourwallet_ext_key`
+<br>
+  - Added fields to `closingd_wire.csv`:`closingd_init`:
+    * `local_wallet_index`
+    * `local_wallet_ext_key`
+<br>
+In all of the above cases we only care about the `index`, but we update the PSBT sent to the signer and `ext_key` completes the PSBT element.
+  
+* Added field to `openingd_wire.csv`:`openingd_got_offer`:
+  - `our_shutdown_wallet_index`
+<br>
+* Added field to `openingd_wire.csv`:`openingd_funder_start`:
+  - `upfront_shutdown_wallet_index`
+<br>
+
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