diff --git a/README.md b/README.md
index a95a1ee..7f0a88b 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # ORE
 
-ORE is a crypto mining game.
+ORE is a crypto mining protocol.
 
 
 ## API
@@ -13,6 +13,7 @@ ORE is a crypto mining game.
 
 #### Mining
 - [`Automate`](program/src/automate.rs) - Configures a new automation.
+- [`Checkpoint`](program/src/checkpoint.rs) - Checkpoints rewards from an prior round.
 - [`ClaimORE`](program/src/claim_ore.rs) - Claims ORE mining rewards.
 - [`ClaimSOL`](program/src/claim_sol.rs) - Claims SOL mining rewards.
 - [`Deploy`](program/src/deploy.rs) – Deploys SOL to claim space on the board.
@@ -36,11 +37,11 @@ ORE is a crypto mining game.
 
 ## State
 - [`Automation`](api/src/state/automation.rs) - Tracks automation configs. 
-- [`Board`](api/src/state/board.rs) - Holds current game state.
+- [`Board`](api/src/state/board.rs) - Tracks the current round number and timestamps.
 - [`Config`](api/src/state/config.rs) - Global program configs.
 - [`Miner`](api/src/state/miner.rs) - Tracks a miner's game state.
+- [`Round`](api/src/state/round.rs) - Tracks the game state of a given round.
 - [`Seeker`](api/src/state/seeker.rs) - Tracks whether a Seeker token has been claimed.
-- [`Square`](api/src/state/square.rs) - The blockspace state and claims.
 - [`Stake`](api/src/state/stake.rs) - Manages a user's staking activity.
 - [`Treasury`](api/src/state/treasury.rs) - Mints, burns, and escrows ORE tokens. 
 
diff --git a/program/src/checkpoint.rs b/program/src/checkpoint.rs
index f945070..b251a5e 100644
--- a/program/src/checkpoint.rs
+++ b/program/src/checkpoint.rs
@@ -13,52 +13,48 @@ pub fn process_checkpoint(accounts: &[AccountInfo<'_>], _data: &[u8]) -> Program
     signer_info.is_signer()?;
     let board = board_info.as_account::<Board>(&ore_api::ID)?;
     let miner = miner_info.as_account_mut::<Miner>(&ore_api::ID)?;
+
     // If miner has already checkpointed this round, return.
     if miner.checkpoint_id == miner.round_id {
         return Ok(());
     }
+
+    // If round account is empty, verify the correct account was provided.
+    // This can happen if the miner attempted to checkpoint after the round expired and the account was closed.
+    // In this case, the miner forfeits any potential rewards.
     if round_info.data_is_empty() {
-        // If round account is empty, ensure the correct account was provided.
-        // This can happen if the miner attempted to checkpoint after the round expired and the account was closed.
-        // In this case, the miner forfeits any potential rewards.
         round_info.has_seeds(&[ROUND, &miner.round_id.to_le_bytes()], &ore_api::ID)?;
         miner.checkpoint_id = miner.round_id;
         return Ok(());
     }
+
     let round = round_info.as_account_mut::<Round>(&ore_api::ID)?;
-
-    // Ensure miner round ID matches the provided round.
-    if round.id != miner.round_id {
-        return Ok(());
-    }
-
     treasury_info.as_account::<Treasury>(&ore_api::ID)?;
     system_program.is_program(&system_program::ID)?;
 
-    // If round is current round, return.
-    if round.id == board.round_id {
+    // If round is current round, or the miner round ID does not match the provided round, return.
+    if round.id == board.round_id || round.id != miner.round_id {
         return Ok(());
     }
 
     // Ensure round is not expired.
+    // In this case, the miner forfeits any potential rewards.
     if clock.slot >= round.expires_at {
-        // In this case, the miner forfeits any potential rewards.
         miner.checkpoint_id = miner.round_id;
         return Ok(());
     }
 
     // Get the RNG.
+    // If the round has no RNG, no one wins.
     let Some(r) = round.rng() else {
-        // If the round has no RNG, no one wins.
         miner.checkpoint_id = miner.round_id;
         return Ok(());
     };
 
     // Calculate bot fee.
+    // If the round expires in less than 12h, anyone may checkpoint this account and collect the bot fee.
     let mut bot_fee = 0;
     if clock.slot >= round.expires_at - TWELVE_HOURS_SLOTS {
-        // The round expires in less than 12h.
-        // Anyone may checkpoint this account and collect the bot fee.
         bot_fee = miner.checkpoint_fee;
         miner.checkpoint_fee = 0;
     }
@@ -112,14 +108,6 @@ pub fn process_checkpoint(accounts: &[AccountInfo<'_>], _data: &[u8]) -> Program
         miner_info.send(bot_fee, &signer_info);
     }
 
-    // Assert round has sufficient funds for rent.
-    let account_size = 8 + std::mem::size_of::<Round>();
-    let required_rent = Rent::get()?.minimum_balance(account_size);
-    assert!(
-        round_info.lamports() >= required_rent,
-        "Round does not have sufficient funds for rent"
-    );
-
     let account_size = 8 + std::mem::size_of::<Miner>();
     let required_rent = Rent::get()?.minimum_balance(account_size);
     assert!(