start of simulation/ROADMAP.md

Author: Saizan

simulation/ROADMAP.md

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+* Reuse `relayNode` but use Leios-specific blocks.
+* Also need Praos layer for Ranking blocks, could be high-level/abstract.
+  - Could start with Shelley's ChainSync with whole-blocks: overestimates ranking blocks traffic.
+* Actually implement Leios protocol, rather than just send blocks.
+  - Non-block-producing nodes might skip some parts like downloading votes.
+  - Some nodes produce transactions, with some distribution governing the timeslots.
+     * Later: Simulation scenario might determine transactions submitted over time.
+  - Needed structures for the node:
+    - Mempool of valid transactions (to include in IBs).
+      - Challenge: minimize inclusion of same/conflicting tx in separate IBs.
+    - Set for certifiable EBs to include in RBs.
+      * Actually we have to accumulate votes for EBs in general: only from specific slot ranges though.
+    - Ledger state
+    - Base chain (See Shelley's ChainDB ?)
+    - Two sets of IBs
+      * Validated, to relay.
+      * Waiting to be validated, because ledger state is lagging.
+        - IBs carry reference to RB whose ledger state is needed to validate (Discuss with research).
+    - Blocks/Votes should be indexable by slot range, as pipelines are based on slices.
+      * Old enough ones should be pruned: unless they are referenced (or could be?) by a RB though.
+        - Can we throw away old non-RB-referenced but Vote2-certified EBs? Asked research in discussion.
+  - Need to trigger tasks on new slot:
+    * Different VRF lotteries for each of: IB, Link EB, Endorse EB, Vote1, Vote2, RB.
+    * A slot lasts 1 second.