amend simd-0123

Author: jstarry

proposals/0123-block-revenue-distribution.md

@@ -137,43 +137,44 @@ vote state field `pending_delegator_rewards` and added to the balance of vote
 account. If either of these conditions is violated, the delegator rewards amount
 MUST be burned.
 
-### Runtime: Delegator Rewards Distribution
+### Runtime: Partitioned Rewards Calculation
+
+During the beginning of the first block of each epoch, all pending delegator
+rewards from active vote accounts MUST be transferred to the epoch rewards
+sysvar account for distribution. Active vote accounts are any vote accounts that
+were initialized at the beginning of the reward epoch and had a non-zero
+active stake delegation. For each vote account, retrieve its state at the end of
+the reward epoch and check the `pending_delegator_rewards` field in its vote
+state. Let this value be `P`. If `P` is non-zero, set the
+`pending_delegator_rewards` field to `0` and deduct `P` from the vote account's
+lamport balance and credit it to the epoch rewards sysvar account.
+
+### Runtime: Partitioned Rewards Distribution
+
+Utilize the existing partitioned rewards distribution mechanism described in
+[SIMD-0118] to distribute block revenue rewards as well.
 
 When calculating stake delegation rewards for a particular completed reward
 epoch, construct a list of all vote accounts that were initialized at the
 beginning of the reward epoch and had a non-zero active stake delegation. For
 each vote account, retrieve its state at the end of the reward epoch and check
 the `pending_delegator_rewards` field in its vote state. Let this value be `P`.
-If `P` is non-zero, use it to calculate rewards for each of the stake accounts
-delegated to the vote account as follows: 
-
-1. Sum all active stake delegated to the vote account during the reward epoch
-epoch. Let this total be `A`.
-
-2. For each individual stake account, multiply its active stake from the
-reward epoch by `P`, and divide the result by `A` using integer division.
-Discard any fractional lamports.
-
-After calculating all individual stake rewards, sum them to obtain `D`, the
-total distribution amount. Because of integer division, the full amount `P` may
-not be distributed so compute the amount to be burned, `B`, as the difference
-between `P` and `D`.
-
-If no blocks in the epoch following the completed reward epoch have been
-processed yet, subtract `B` from both the vote account’s lamport balance and its
-`pending_delegator_rewards` field and store the updated vote account. Finally,
-the burn amount `B` should also be deducted from the cluster capitalization.
+Then if `P` is non-zero, sum all active stake delegated to the vote account
+during the reward epoch epoch. Let this total be `A`.
 
 #### Individual Delegator Reward
 
-The stake reward distribution amounts for each stake account calculated above
-can then be used to construct a list of stake reward entries which MUST be
-partitioned and distributed according to [SIMD-0118].
+For each individual stake account, multiply its active stake from the reward
+epoch by `P`, and divide the result by `A` using integer division to get the
+block revenue reward distribution amount.
+
+The reward distribution amounts for each stake account can then be used to
+construct a list of stake reward entries which MUST be partitioned and
+distributed according to [SIMD-0118].
 
 When reward entries are used to distribute rewards pool funds during partitioned
-rewards distribution, the delegated vote account for each rewarded stake account
-must have its `pending_delegator_rewards` field and its balance deducted with
-the amount of rewards distributed to keep capitalization consistent.
+rewards distribution, the epoch rewards sysvar balance should be debited to keep
+capitalization consistent.
 
 [SIMD-0118]: https://github.com/solana-foundation/solana-improvement-documents/pull/118