md: Update diagram

README.md

@@ -486,7 +486,15 @@ In that case, the successful participants can eventually make the stuck particip
 by presenting them the recovery data.
 The recovery data can, e.g., be attached to the first request to initiate a FROST signing session.
 
-### Steps of a ChillDKG Session
+### Overview of a ChillDKG Session
+
+TODO Write
+
+![chilldkg diagram](images/chilldkg-sequence.png)
+
+### API Documentation
+
+TODO Write
 
 <!--pydoc.md-->
 #### hostpubkey
@@ -791,9 +799,6 @@ a second device.
   data or recovery data that does not match the provided seed.
 <!--end of pydoc.md-->
 
-TODO Fix diagram
-![chilldkg diagram](images/chilldkg-sequence.png)
-
 ### Backup and Recovery
 
 Losing the secret share or the threshold public key will render the participant incapable of participating in signing sessions.

images/chilldkg-sequence.txt

@@ -3,16 +3,20 @@ title ChillDKG
 participant Participant
 participant Coordinator
 
-rnote over Participant: chilldkg_hostpubkey
-Participant->Coordinator : my_hostpubkey
-Coordinator->Participant : hostpubkeys
-rnote over Participant: chilldkg_setup_id
-note across: Compare setup_id with other participants out-of-band
+group Generation of host public keys
+rnote over Participant: hostpubkey(seed)
+Participant->Coordinator: hostpubkey
+end
 
-rnote over Participant: chilldkg_round1
-Participant->Coordinator : vss_commitment_ext, enc_gen_shares
-Coordinator->Participant : vss_commitments_sum, all_enc_shares_sum
-rnote over Participant: chilldkg_round2
-Participant->Coordinator : eq_round1
-Coordinator->Participant : cert
-rnote over Participant: chilldkg_finalize
+group Session
+Coordinator->Participant: hostpubkeys, t
+rnote over Participant: partcipant_step1(...)
+Participant->Coordinator: pmsg1
+rnote over Coordinator: coordinator_step(...)
+Coordinator->Participant: cmsg1
+rnote over Participant: partcipant_step2(...)
+Participant->Coordinator: pmsg2
+rnote over Coordinator: coordinator_finalize(...)
+Coordinator->Participant: cmsg2
+rnote over Participant: participant_finalize(...)
+end