diff --git a/constants/Cargo.toml b/constants/Cargo.toml
index aa8307a..37d506c 100644
--- a/constants/Cargo.toml
+++ b/constants/Cargo.toml
@@ -10,7 +10,6 @@ keywords    = ["cuprate", "constants"]
 
 [features]
 default    = []
-cryptonote = []
 
 [dependencies]
 
diff --git a/helper/build.rs b/constants/build.rs
similarity index 93%
rename from helper/build.rs
rename to constants/build.rs
index 709db42..a680714 100644
--- a/helper/build.rs
+++ b/constants/build.rs
@@ -1,9 +1,7 @@
 fn main() {
-    #[cfg(feature = "constants")]
     set_commit_env();
 }
 
-#[cfg(feature = "constants")]
 /// This sets the git `COMMIT` environment variable.
 fn set_commit_env() {
     const PATH: &str = "../.git/refs/heads/";
diff --git a/constants/src/block.rs b/constants/src/block.rs
new file mode 100644
index 0000000..3059e38
--- /dev/null
+++ b/constants/src/block.rs
@@ -0,0 +1,64 @@
+//! TODO
+
+use crate::{difficulty, macros::monero_definition_link};
+
+/// The maximum block height possible.
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 40)]
+pub const MAX_BLOCK_HEIGHT: usize = 500_000_000;
+
+/// TODO
+pub const CURRENT_BLOCK_MAJOR_VERSION: u64 = 1;
+
+/// TODO
+pub const CURRENT_BLOCK_MINOR_VERSION: u64 = 0;
+
+/// TODO
+pub const CRYPTONOTE_BLOCK_FUTURE_TIME_LIMIT: u64 = 60 * 60 * 2;
+
+/// TODO
+pub const CRYPTONOTE_REWARD_BLOCKS_WINDOW: u64 = 100;
+
+/// TODO
+pub const CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2: u64 = 60000; //size of block (bytes) after which reward for block calculated ;using block size
+
+/// TODO
+pub const CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1: u64 = 20000; //size of block (bytes) after which reward for block calculated ;using block size - before first fork
+
+/// TODO
+pub const CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5: u64 = 300000; //size of block (bytes) after which reward for block calculated ;using block size - second change, from v5
+
+/// TODO
+pub const CRYPTONOTE_LONG_TERM_BLOCK_WEIGHT_WINDOW_SIZE: u64 = 100000; // size in blocks of the long term block weight median window;
+
+/// TODO
+pub const CRYPTONOTE_SHORT_TERM_BLOCK_WEIGHT_SURGE_FACTOR: u64 = 50;
+
+/// TODO
+pub const ORPHANED_BLOCKS_MAX_COUNT: u64 = 100;
+
+/// TODO
+pub const CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE: u64 = 600;
+
+/// TODO
+pub const DIFFICULTY_BLOCKS_ESTIMATE_TIMESPAN: u64 = difficulty::DIFFICULTY_TARGET_V1.as_secs(); //just alias; used by tests;
+
+/// TODO
+pub const BLOCKS_IDS_SYNCHRONIZING_DEFAULT_COUNT: u64 = 10000; //by default, blocks ids count in synchronizing;
+
+/// TODO
+pub const BLOCKS_IDS_SYNCHRONIZING_MAX_COUNT: u64 = 25000; //max blocks ids count in synchronizing;
+
+/// TODO
+pub const BLOCKS_SYNCHRONIZING_DEFAULT_COUNT_PRE_V4: u64 = 100; //by default, blocks count in blocks downloading;
+
+/// TODO
+pub const BLOCKS_SYNCHRONIZING_DEFAULT_COUNT: u64 = 20; //by default, blocks count in blocks downloading;
+
+/// TODO
+pub const BLOCKS_SYNCHRONIZING_MAX_COUNT: u64 = 2048; //must be a power of 2, greater than 128, equal to ;SEEDHASH_EPOCH_BLOCKS
+
+/// TODO
+pub const BULLETPROOF_MAX_OUTPUTS: u64 = 16;
+
+/// TODO
+pub const BULLETPROOF_PLUS_MAX_OUTPUTS: u64 = 16;
diff --git a/constants/src/build.rs b/constants/src/build.rs
new file mode 100644
index 0000000..af11ef7
--- /dev/null
+++ b/constants/src/build.rs
@@ -0,0 +1,22 @@
+//! TODO
+
+/// The current commit hash of the root Cuprate repository.
+///
+/// # Case & length
+/// It is guaranteed that `COMMIT` will be:
+/// - Lowercase ASCII
+/// - 40 characters long (no newline)
+///
+/// ```rust
+/// # use cuprate_constants::build::*;
+/// assert_eq!(COMMIT.is_ascii());
+/// assert_eq!(COMMIT.as_bytes().len(), 40);
+/// assert_eq!(COMMIT.to_lowercase(), COMMIT);
+/// ```
+pub const COMMIT: &str = core::env!("COMMIT"); // Set in `helper/build.rs`.
+
+/// TODO
+pub const DEBUG: bool = cfg!(debug_assertions);
+
+/// TODO
+pub const RELEASE: bool = !DEBUG;
diff --git a/constants/src/cryptonote.rs b/constants/src/cryptonote.rs
deleted file mode 100644
index 3088489..0000000
--- a/constants/src/cryptonote.rs
+++ /dev/null
@@ -1,359 +0,0 @@
-//! TODO
-
-use crate::macros::monero_definition_link;
-
-/// TODO
-///
-#[doc = monero_definition_link!()]
-pub const CRYPTONOTE_MAX_BLOCK_HEIGHT: usize = 500_000_000;
-
-/// The default log stripes for Monero pruning.
-pub const CRYPTONOTE_PRUNING_LOG_STRIPES: u32 = 3;
-
-/// The amount of blocks that peers keep before another stripe starts storing blocks.
-pub const CRYPTONOTE_PRUNING_STRIPE_SIZE: usize = 4096;
-
-/// The amount of blocks from the top of the chain that should not be pruned.
-pub const CRYPTONOTE_PRUNING_TIP_BLOCKS: usize = 5500;
-
-/// TODO
-pub const CRYPTONOTE_DNS_TIMEOUT_MS: u64 = 20000;
-
-/// TODO
-pub const CRYPTONOTE_MAX_BLOCK_NUMBER: u64 = 500000000;
-
-/// TODO
-pub const CRYPTONOTE_MAX_TX_SIZE: u64 = 1000000;
-
-/// TODO
-pub const CRYPTONOTE_MAX_TX_PER_BLOCK: u64 = 0x10000000;
-
-/// TODO
-pub const CRYPTONOTE_PUBLIC_ADDRESS_TEXTBLOB_VER: u64 = 0;
-
-/// TODO
-pub const CRYPTONOTE_MINED_MONEY_UNLOCK_WINDOW: u64 = 60;
-
-/// TODO
-pub const CURRENT_TRANSACTION_VERSION: u64 = 2;
-
-/// TODO
-pub const CURRENT_BLOCK_MAJOR_VERSION: u64 = 1;
-
-/// TODO
-pub const CURRENT_BLOCK_MINOR_VERSION: u64 = 0;
-
-/// TODO
-pub const CRYPTONOTE_BLOCK_FUTURE_TIME_LIMIT: u64 = 60 * 60 * 2;
-
-/// TODO
-pub const CRYPTONOTE_DEFAULT_TX_SPENDABLE_AGE: u64 = 10;
-
-/// TODO
-pub const BLOCKCHAIN_TIMESTAMP_CHECK_WINDOW: u64 = 60;
-
-// MONEY_SUPPLY - total number coins to be generated
-pub const MONEY_SUPPLY: u64 = u64::MAX - 1;
-
-/// TODO
-pub const EMISSION_SPEED_FACTOR_PER_MINUTE: u64 = 20;
-
-/// TODO
-pub const FINAL_SUBSIDY_PER_MINUTE: u64 = 300000000000; // 3 * pow(10, 11);
-
-/// TODO
-pub const CRYPTONOTE_REWARD_BLOCKS_WINDOW: u64 = 100;
-
-/// TODO
-pub const CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2: u64 = 60000; //size of block (bytes) after which reward for block calculated ;using block size
-
-/// TODO
-pub const CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V1: u64 = 20000; //size of block (bytes) after which reward for block calculated ;using block size - before first fork
-
-/// TODO
-pub const CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5: u64 = 300000; //size of block (bytes) after which reward for block calculated ;using block size - second change, from v5
-
-/// TODO
-pub const CRYPTONOTE_LONG_TERM_BLOCK_WEIGHT_WINDOW_SIZE: u64 = 100000; // size in blocks of the long term block weight median window;
-
-/// TODO
-pub const CRYPTONOTE_SHORT_TERM_BLOCK_WEIGHT_SURGE_FACTOR: u64 = 50;
-
-/// TODO
-pub const CRYPTONOTE_COINBASE_BLOB_RESERVED_SIZE: u64 = 600;
-
-/// TODO
-pub const CRYPTONOTE_DISPLAY_DECIMAL_POINT: u64 = 12;
-
-// COIN - number of smallest units in one coin
-pub const COIN: u64 = 1000000000000; // pow(10, 12);
-
-/// TODO
-pub const FEE_PER_KB_OLD: u64 = 10000000000; // pow(10, 10);
-
-/// TODO
-pub const FEE_PER_KB: u64 = 2000000000; // 2 * pow(10, 9);
-
-/// TODO
-pub const FEE_PER_BYTE: u64 = 300000;
-
-/// TODO
-pub const DYNAMIC_FEE_PER_KB_BASE_FEE: u64 = 2000000000; // 2 * pow(10,9);
-
-/// TODO
-pub const DYNAMIC_FEE_PER_KB_BASE_BLOCK_REWARD: u64 = 10000000000000; // 10 * pow(10,12);
-
-/// TODO
-pub const DYNAMIC_FEE_PER_KB_BASE_FEE_V5: u64 = 2000000000
-    * CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2
-    / CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5;
-
-/// TODO
-pub const DYNAMIC_FEE_REFERENCE_TRANSACTION_WEIGHT: u64 = 3000;
-
-/// TODO
-pub const ORPHANED_BLOCKS_MAX_COUNT: u64 = 100;
-
-/// TODO
-pub const DIFFICULTY_TARGET_V2: u64 = 120; // seconds;
-
-/// TODO
-pub const DIFFICULTY_TARGET_V1: u64 = 60; // seconds - before first fork;
-
-/// TODO
-pub const DIFFICULTY_WINDOW: u64 = 720; // blocks;
-
-/// TODO
-pub const DIFFICULTY_LAG: u64 = 15; // !!!;
-
-/// TODO
-pub const DIFFICULTY_CUT: u64 = 60; // timestamps to cut after sorting;
-
-/// TODO
-pub const DIFFICULTY_BLOCKS_COUNT: u64 = DIFFICULTY_WINDOW + DIFFICULTY_LAG;
-
-/// TODO
-pub const CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS_V1: u64 =
-    DIFFICULTY_TARGET_V1 * CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS;
-
-/// TODO
-pub const CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_SECONDS_V2: u64 =
-    DIFFICULTY_TARGET_V2 * CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS;
-
-/// TODO
-pub const CRYPTONOTE_LOCKED_TX_ALLOWED_DELTA_BLOCKS: u64 = 1;
-
-/// TODO
-pub const DIFFICULTY_BLOCKS_ESTIMATE_TIMESPAN: u64 = DIFFICULTY_TARGET_V1; //just alias; used by tests;
-
-/// TODO
-pub const BLOCKS_IDS_SYNCHRONIZING_DEFAULT_COUNT: u64 = 10000; //by default, blocks ids count in synchronizing;
-
-/// TODO
-pub const BLOCKS_IDS_SYNCHRONIZING_MAX_COUNT: u64 = 25000; //max blocks ids count in synchronizing;
-
-/// TODO
-pub const BLOCKS_SYNCHRONIZING_DEFAULT_COUNT_PRE_V4: u64 = 100; //by default, blocks count in blocks downloading;
-
-/// TODO
-pub const BLOCKS_SYNCHRONIZING_DEFAULT_COUNT: u64 = 20; //by default, blocks count in blocks downloading;
-
-/// TODO
-pub const BLOCKS_SYNCHRONIZING_MAX_COUNT: u64 = 2048; //must be a power of 2, greater than 128, equal to ;SEEDHASH_EPOCH_BLOCKS
-
-/// TODO
-pub const CRYPTONOTE_MEMPOOL_TX_LIFETIME: u64 = (86400 * 3); //seconds, three days;
-
-/// TODO
-pub const CRYPTONOTE_MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME: u64 = 604800; //seconds, one week;
-
-/// TODO
-pub const CRYPTONOTE_DANDELIONPP_STEMS: u64 = 2; // number of outgoing stem connections per epoch;
-
-/// TODO
-pub const CRYPTONOTE_DANDELIONPP_FLUFF_PROBABILITY: u64 = 20; // out of 100;
-
-/// TODO
-pub const CRYPTONOTE_DANDELIONPP_MIN_EPOCH: u64 = 10; // minutes;
-
-/// TODO
-pub const CRYPTONOTE_DANDELIONPP_EPOCH_RANGE: u64 = 30; // seconds;
-
-/// TODO
-pub const CRYPTONOTE_DANDELIONPP_FLUSH_AVERAGE: u64 = 5; // seconds average for poisson distributed fluff flush;
-
-/// TODO
-pub const CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE: u64 = 39; // seconds (see tx_pool.cpp for more info);
-
-// see src/cryptonote_protocol/levin_notify.cpp
-/// TODO
-pub const CRYPTONOTE_NOISE_MIN_EPOCH: u64 = 5; // minutes;
-
-/// TODO
-pub const CRYPTONOTE_NOISE_EPOCH_RANGE: u64 = 30; // seconds;
-
-/// TODO
-pub const CRYPTONOTE_NOISE_MIN_DELAY: u64 = 10; // seconds;
-
-/// TODO
-pub const CRYPTONOTE_NOISE_DELAY_RANGE: u64 = 5; // seconds;
-
-/// TODO
-pub const CRYPTONOTE_NOISE_BYTES: u64 = 3 * 1024; // 3 KiB;
-
-/// TODO
-pub const CRYPTONOTE_NOISE_CHANNELS: u64 = 2; // Max outgoing connections per zone used for noise/covert sending;
-
-// Both below are in seconds. The idea is to delay forwarding from i2p/tor
-// to ipv4/6, such that 2+ incoming connections _could_ have sent the tx
-/// TODO
-pub const CRYPTONOTE_FORWARD_DELAY_BASE: u64 =
-    CRYPTONOTE_NOISE_MIN_DELAY + CRYPTONOTE_NOISE_DELAY_RANGE;
-
-/// TODO
-pub const CRYPTONOTE_FORWARD_DELAY_AVERAGE: u64 =
-    CRYPTONOTE_FORWARD_DELAY_BASE + (CRYPTONOTE_FORWARD_DELAY_BASE / 2);
-
-/// TODO
-pub const CRYPTONOTE_MAX_FRAGMENTS: u64 = 20; // ~20 * NOISE_BYTES max payload size for covert/noise send;
-
-/// TODO
-pub const COMMAND_RPC_GET_BLOCKS_FAST_MAX_BLOCK_COUNT: u64 = 1000;
-/// TODO
-pub const COMMAND_RPC_GET_BLOCKS_FAST_MAX_TX_COUNT: u64 = 20000;
-/// TODO
-pub const MAX_RPC_CONTENT_LENGTH: u64 = 1048576; // 1 MB
-
-/// TODO
-pub const P2P_LOCAL_WHITE_PEERLIST_LIMIT: u64 = 1000;
-/// TODO
-pub const P2P_LOCAL_GRAY_PEERLIST_LIMIT: u64 = 5000;
-
-/// TODO
-pub const P2P_DEFAULT_CONNECTIONS_COUNT: u64 = 12;
-/// TODO
-pub const P2P_DEFAULT_HANDSHAKE_INTERVAL: u64 = 60; //secondes
-/// TODO
-pub const P2P_DEFAULT_PACKET_MAX_SIZE: u64 = 50000000; //50000000 bytes maximum packet size
-/// TODO
-pub const P2P_DEFAULT_PEERS_IN_HANDSHAKE: u64 = 250;
-/// TODO
-pub const P2P_MAX_PEERS_IN_HANDSHAKE: u64 = 250;
-/// TODO
-pub const P2P_DEFAULT_CONNECTION_TIMEOUT: u64 = 5000; //5 seconds
-/// TODO
-pub const P2P_DEFAULT_SOCKS_CONNECT_TIMEOUT: u64 = 45; // seconds
-/// TODO
-pub const P2P_DEFAULT_PING_CONNECTION_TIMEOUT: u64 = 2000; //2 seconds
-/// TODO
-pub const P2P_DEFAULT_INVOKE_TIMEOUT: u64 = 60 * 2 * 1000; //2 minutes
-/// TODO
-pub const P2P_DEFAULT_HANDSHAKE_INVOKE_TIMEOUT: u64 = 5000; //5 seconds
-/// TODO
-pub const P2P_DEFAULT_WHITELIST_CONNECTIONS_PERCENT: u64 = 70;
-/// TODO
-pub const P2P_DEFAULT_ANCHOR_CONNECTIONS_COUNT: u64 = 2;
-/// TODO
-pub const P2P_DEFAULT_SYNC_SEARCH_CONNECTIONS_COUNT: u64 = 2;
-/// TODO
-pub const P2P_DEFAULT_LIMIT_RATE_UP: u64 = 2048; // kB/s
-/// TODO
-pub const P2P_DEFAULT_LIMIT_RATE_DOWN: u64 = 8192; // kB/s
-
-/// TODO
-pub const P2P_FAILED_ADDR_FORGET_SECONDS: u64 = 60 * 60; //1 hour
-/// TODO
-pub const P2P_IP_BLOCKTIME: u64 = 60 * 60 * 24; //24 hour
-/// TODO
-pub const P2P_IP_FAILS_BEFORE_BLOCK: u64 = 10;
-/// TODO
-pub const P2P_IDLE_CONNECTION_KILL_INTERVAL: u64 = 5 * 60; //5 minutes
-
-/// TODO
-pub const P2P_SUPPORT_FLAG_FLUFFY_BLOCKS: u64 = 0x01;
-/// TODO
-pub const P2P_SUPPORT_FLAGS: u64 = P2P_SUPPORT_FLAG_FLUFFY_BLOCKS;
-
-/// TODO
-pub const RPC_IP_FAILS_BEFORE_BLOCK: u64 = 3;
-
-/// TODO
-pub const THREAD_STACK_SIZE: u64 = 5 * 1024 * 1024;
-
-/// TODO
-pub const HF_VERSION_DYNAMIC_FEE: u64 = 4;
-/// TODO
-pub const HF_VERSION_MIN_MIXIN_4: u64 = 6;
-/// TODO
-pub const HF_VERSION_MIN_MIXIN_6: u64 = 7;
-/// TODO
-pub const HF_VERSION_MIN_MIXIN_10: u64 = 8;
-/// TODO
-pub const HF_VERSION_MIN_MIXIN_15: u64 = 15;
-/// TODO
-pub const HF_VERSION_ENFORCE_RCT: u64 = 6;
-/// TODO
-pub const HF_VERSION_PER_BYTE_FEE: u64 = 8;
-/// TODO
-pub const HF_VERSION_SMALLER_BP: u64 = 10;
-/// TODO
-pub const HF_VERSION_LONG_TERM_BLOCK_WEIGHT: u64 = 10;
-/// TODO
-pub const HF_VERSION_MIN_2_OUTPUTS: u64 = 12;
-/// TODO
-pub const HF_VERSION_MIN_V2_COINBASE_TX: u64 = 12;
-/// TODO
-pub const HF_VERSION_SAME_MIXIN: u64 = 12;
-/// TODO
-pub const HF_VERSION_REJECT_SIGS_IN_COINBASE: u64 = 12;
-/// TODO
-pub const HF_VERSION_ENFORCE_MIN_AGE: u64 = 12;
-/// TODO
-pub const HF_VERSION_EFFECTIVE_SHORT_TERM_MEDIAN_IN_PENALTY: u64 = 12;
-/// TODO
-pub const HF_VERSION_EXACT_COINBASE: u64 = 13;
-/// TODO
-pub const HF_VERSION_CLSAG: u64 = 13;
-/// TODO
-pub const HF_VERSION_DETERMINISTIC_UNLOCK_TIME: u64 = 13;
-/// TODO
-pub const HF_VERSION_BULLETPROOF_PLUS: u64 = 15;
-/// TODO
-pub const HF_VERSION_VIEW_TAGS: u64 = 15;
-/// TODO
-pub const HF_VERSION_2021_SCALING: u64 = 15;
-
-/// TODO
-pub const PER_KB_FEE_QUANTIZATION_DECIMALS: u64 = 8;
-/// TODO
-pub const CRYPTONOTE_SCALING_2021_FEE_ROUNDING_PLACES: u64 = 2;
-
-/// TODO
-pub const HASH_OF_HASHES_STEP: u64 = 512;
-
-/// TODO
-pub const DEFAULT_TXPOOL_MAX_WEIGHT: u64 = 648000000; // 3 days at 300000, in bytes
-
-/// TODO
-pub const BULLETPROOF_MAX_OUTPUTS: u64 = 16;
-/// TODO
-pub const BULLETPROOF_PLUS_MAX_OUTPUTS: u64 = 16;
-
-/// TODO
-pub const CRYPTONOTE_PRUNING_STRIPE_SIZE: u64 = 4096; // the smaller, the smoother the increase
-/// TODO
-pub const CRYPTONOTE_PRUNING_LOG_STRIPES: u64 = 3; // the higher, the more space saved
-/// TODO
-pub const CRYPTONOTE_PRUNING_TIP_BLOCKS: u64 = 5500; // the smaller, the more space saved
-
-/// TODO
-pub const RPC_CREDITS_PER_HASH_SCALE: u64 = 1 << 24;
-
-/// TODO
-pub const DNS_BLOCKLIST_LIFETIME: u64 = 86400 * 8;
-
-//The limit is enough for the mandatory transaction content with 16 outputs (547 bytes),
-//a custom tag (1 byte) and up to 32 bytes of custom data for each recipient.
-// (1+32) + (1+1+16*32) + (1+16*32) = 1060
-/// TODO
-pub const MAX_TX_EXTRA_SIZE: u64 = 1060;
diff --git a/constants/src/difficulty.rs b/constants/src/difficulty.rs
new file mode 100644
index 0000000..dc9f31c
--- /dev/null
+++ b/constants/src/difficulty.rs
@@ -0,0 +1,35 @@
+//! TODO
+
+use std::time::Duration;
+
+use crate::macros::monero_definition_link;
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 81)]
+///
+/// ```rust
+/// # use cuprate_constants::difficulty::*;
+/// assert_eq!(DIFFICULTY_TARGET_V1.as_secs(), 60);
+/// ```
+pub const DIFFICULTY_TARGET_V1: Duration = Duration::from_secs(60);
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 80)]
+///
+/// ```rust
+/// # use cuprate_constants::difficulty::*;
+/// assert_eq!(DIFFICULTY_TARGET_V2.as_secs(), 120);
+/// ```
+pub const DIFFICULTY_TARGET_V2: Duration = Duration::from_secs(120);
+
+/// TODO
+pub const DIFFICULTY_WINDOW: u64 = 720; // blocks;
+
+/// TODO
+pub const DIFFICULTY_LAG: u64 = 15; // !!!;
+
+/// TODO
+pub const DIFFICULTY_CUT: u64 = 60; // timestamps to cut after sorting;
+
+/// TODO
+pub const DIFFICULTY_BLOCKS_COUNT: u64 = DIFFICULTY_WINDOW + DIFFICULTY_LAG;
diff --git a/constants/src/hard_fork.rs b/constants/src/hard_fork.rs
new file mode 100644
index 0000000..911bd22
--- /dev/null
+++ b/constants/src/hard_fork.rs
@@ -0,0 +1,64 @@
+//! TODO
+
+/// TODO
+pub const HF_VERSION_DYNAMIC_FEE: u64 = 4;
+
+/// TODO
+pub const HF_VERSION_MIN_MIXIN_4: u64 = 6;
+
+/// TODO
+pub const HF_VERSION_MIN_MIXIN_6: u64 = 7;
+
+/// TODO
+pub const HF_VERSION_MIN_MIXIN_10: u64 = 8;
+
+/// TODO
+pub const HF_VERSION_MIN_MIXIN_15: u64 = 15;
+
+/// TODO
+pub const HF_VERSION_ENFORCE_RCT: u64 = 6;
+
+/// TODO
+pub const HF_VERSION_PER_BYTE_FEE: u64 = 8;
+
+/// TODO
+pub const HF_VERSION_SMALLER_BP: u64 = 10;
+
+/// TODO
+pub const HF_VERSION_LONG_TERM_BLOCK_WEIGHT: u64 = 10;
+
+/// TODO
+pub const HF_VERSION_MIN_2_OUTPUTS: u64 = 12;
+
+/// TODO
+pub const HF_VERSION_MIN_V2_COINBASE_TX: u64 = 12;
+
+/// TODO
+pub const HF_VERSION_SAME_MIXIN: u64 = 12;
+
+/// TODO
+pub const HF_VERSION_REJECT_SIGS_IN_COINBASE: u64 = 12;
+
+/// TODO
+pub const HF_VERSION_ENFORCE_MIN_AGE: u64 = 12;
+
+/// TODO
+pub const HF_VERSION_EFFECTIVE_SHORT_TERM_MEDIAN_IN_PENALTY: u64 = 12;
+
+/// TODO
+pub const HF_VERSION_EXACT_COINBASE: u64 = 13;
+
+/// TODO
+pub const HF_VERSION_CLSAG: u64 = 13;
+
+/// TODO
+pub const HF_VERSION_DETERMINISTIC_UNLOCK_TIME: u64 = 13;
+
+/// TODO
+pub const HF_VERSION_BULLETPROOF_PLUS: u64 = 15;
+
+/// TODO
+pub const HF_VERSION_VIEW_TAGS: u64 = 15;
+
+/// TODO
+pub const HF_VERSION_2021_SCALING: u64 = 15;
diff --git a/constants/src/lib.rs b/constants/src/lib.rs
index ccb7e20..a34d96e 100644
--- a/constants/src/lib.rs
+++ b/constants/src/lib.rs
@@ -3,5 +3,14 @@
 
 mod macros;
 
-#[cfg(feature = "cryptonote")]
-pub mod cryptonote;
+pub mod block;
+pub mod build;
+pub mod difficulty;
+pub mod hard_fork;
+pub mod money;
+pub mod net;
+pub mod p2p;
+pub mod pruning;
+pub mod rpc;
+pub mod sys;
+pub mod tx;
diff --git a/constants/src/macros.rs b/constants/src/macros.rs
index a19cc80..62d2c6a 100644
--- a/constants/src/macros.rs
+++ b/constants/src/macros.rs
@@ -6,7 +6,8 @@ macro_rules! monero_definition_link {
         $start:literal$(..=$end:literal)? // File lines, e.g. `0..=123` or `0`
     ) => {
         concat!(
-            "[Definition](https://github.com/monero-project/monero/blob/",
+            "",
+            "[Original definition](https://github.com/monero-project/monero/blob/",
             stringify!($commit),
             "/src/",
             $file_path,
diff --git a/constants/src/money.rs b/constants/src/money.rs
new file mode 100644
index 0000000..124bb9c
--- /dev/null
+++ b/constants/src/money.rs
@@ -0,0 +1,41 @@
+//! TODO
+
+use crate::block;
+
+/// `MONEY_SUPPLY` - total number coins to be generated
+pub const MONEY_SUPPLY: u64 = u64::MAX - 1;
+
+/// TODO
+pub const EMISSION_SPEED_FACTOR_PER_MINUTE: u64 = 20;
+
+/// TODO
+pub const FINAL_SUBSIDY_PER_MINUTE: u64 = 300_000_000_000; // 3 * pow(10, 11);
+
+/// TODO
+pub const CRYPTONOTE_DISPLAY_DECIMAL_POINT: u64 = 12;
+
+/// COIN - number of smallest units in one coin
+pub const COIN: u64 = 1000000000000; // pow(10, 12);
+
+/// TODO
+pub const FEE_PER_KB_OLD: u64 = 10000000000; // pow(10, 10);
+
+/// TODO
+pub const FEE_PER_KB: u64 = 2000000000; // 2 * pow(10, 9);
+
+/// TODO
+pub const FEE_PER_BYTE: u64 = 300000;
+
+/// TODO
+pub const DYNAMIC_FEE_PER_KB_BASE_FEE: u64 = 2000000000; // 2 * pow(10,9);
+
+/// TODO
+pub const DYNAMIC_FEE_PER_KB_BASE_BLOCK_REWARD: u64 = 10000000000000; // 10 * pow(10,12);
+
+/// TODO
+pub const DYNAMIC_FEE_PER_KB_BASE_FEE_V5: u64 = 2000000000
+    * block::CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V2
+    / block::CRYPTONOTE_BLOCK_GRANTED_FULL_REWARD_ZONE_V5;
+
+/// TODO
+pub const DYNAMIC_FEE_REFERENCE_TRANSACTION_WEIGHT: u64 = 3000;
diff --git a/constants/src/net.rs b/constants/src/net.rs
new file mode 100644
index 0000000..2767c30
--- /dev/null
+++ b/constants/src/net.rs
@@ -0,0 +1,7 @@
+//! TODO
+
+/// TODO
+pub const CRYPTONOTE_DNS_TIMEOUT_MS: u64 = 20000;
+
+/// TODO
+pub const DNS_BLOCKLIST_LIFETIME: u64 = 86400 * 8;
diff --git a/constants/src/p2p.rs b/constants/src/p2p.rs
new file mode 100644
index 0000000..67627a4
--- /dev/null
+++ b/constants/src/p2p.rs
@@ -0,0 +1,76 @@
+//! TODO
+
+/// TODO
+pub const CRYPTONOTE_DNS_TIMEOUT_MS: u64 = 20000;
+
+/// TODO
+pub const DNS_BLOCKLIST_LIFETIME: u64 = 86400 * 8;
+
+/// TODO
+pub const P2P_LOCAL_WHITE_PEERLIST_LIMIT: u64 = 1000;
+
+/// TODO
+pub const P2P_LOCAL_GRAY_PEERLIST_LIMIT: u64 = 5000;
+
+/// TODO
+pub const P2P_DEFAULT_CONNECTIONS_COUNT: u64 = 12;
+
+/// TODO
+pub const P2P_DEFAULT_HANDSHAKE_INTERVAL: u64 = 60; //secondes
+
+/// TODO
+pub const P2P_DEFAULT_PACKET_MAX_SIZE: u64 = 50000000; //50000000 bytes maximum packet size
+
+/// TODO
+pub const P2P_DEFAULT_PEERS_IN_HANDSHAKE: u64 = 250;
+
+/// TODO
+pub const P2P_MAX_PEERS_IN_HANDSHAKE: u64 = 250;
+
+/// TODO
+pub const P2P_DEFAULT_CONNECTION_TIMEOUT: u64 = 5000; //5 seconds
+
+/// TODO
+pub const P2P_DEFAULT_SOCKS_CONNECT_TIMEOUT: u64 = 45; // seconds
+
+/// TODO
+pub const P2P_DEFAULT_PING_CONNECTION_TIMEOUT: u64 = 2000; //2 seconds
+
+/// TODO
+pub const P2P_DEFAULT_INVOKE_TIMEOUT: u64 = 60 * 2 * 1000; //2 minutes
+
+/// TODO
+pub const P2P_DEFAULT_HANDSHAKE_INVOKE_TIMEOUT: u64 = 5000; //5 seconds
+
+/// TODO
+pub const P2P_DEFAULT_WHITELIST_CONNECTIONS_PERCENT: u64 = 70;
+
+/// TODO
+pub const P2P_DEFAULT_ANCHOR_CONNECTIONS_COUNT: u64 = 2;
+
+/// TODO
+pub const P2P_DEFAULT_SYNC_SEARCH_CONNECTIONS_COUNT: u64 = 2;
+
+/// TODO
+pub const P2P_DEFAULT_LIMIT_RATE_UP: u64 = 2048; // kB/s
+
+/// TODO
+pub const P2P_DEFAULT_LIMIT_RATE_DOWN: u64 = 8192; // kB/s
+
+/// TODO
+pub const P2P_FAILED_ADDR_FORGET_SECONDS: u64 = 60 * 60; //1 hour
+
+/// TODO
+pub const P2P_IP_BLOCKTIME: u64 = 60 * 60 * 24; //24 hour
+
+/// TODO
+pub const P2P_IP_FAILS_BEFORE_BLOCK: u64 = 10;
+
+/// TODO
+pub const P2P_IDLE_CONNECTION_KILL_INTERVAL: u64 = 5 * 60; //5 minutes
+
+/// TODO
+pub const P2P_SUPPORT_FLAG_FLUFFY_BLOCKS: u64 = 0x01;
+
+/// TODO
+pub const P2P_SUPPORT_FLAGS: u64 = P2P_SUPPORT_FLAG_FLUFFY_BLOCKS;
diff --git a/constants/src/pruning.rs b/constants/src/pruning.rs
new file mode 100644
index 0000000..4cbbb3a
--- /dev/null
+++ b/constants/src/pruning.rs
@@ -0,0 +1,10 @@
+//! TODO
+
+/// The default log stripes for Monero pruning.
+pub const CRYPTONOTE_PRUNING_LOG_STRIPES: u32 = 3;
+
+/// The amount of blocks that peers keep before another stripe starts storing blocks.
+pub const CRYPTONOTE_PRUNING_STRIPE_SIZE: usize = 4096;
+
+/// The amount of blocks from the top of the chain that should not be pruned.
+pub const CRYPTONOTE_PRUNING_TIP_BLOCKS: usize = 5500;
diff --git a/constants/src/rpc.rs b/constants/src/rpc.rs
new file mode 100644
index 0000000..be42c4c
--- /dev/null
+++ b/constants/src/rpc.rs
@@ -0,0 +1,40 @@
+//! TODO
+//!
+//! - <https://github.com/monero-project/monero/blob/cc73fe71162d564ffda8e549b79a350bca53c454/src/rpc/core_rpc_server.cpp#L63-L77>
+//! - <https://github.com/monero-project/monero/blob/a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623/src/cryptonote_core/cryptonote_core.cpp#L63-L72>
+
+/// TODO
+pub const MAX_RESTRICTED_FAKE_OUTS_COUNT: usize = 40;
+
+/// TODO
+pub const MAX_RESTRICTED_GLOBAL_FAKE_OUTS_COUNT: usize = 5000;
+
+/// 3 days max, the wallet requests 1.8: usize = days.
+pub const OUTPUT_HISTOGRAM_RECENT_CUTOFF_RESTRICTION: usize = 3 * 86400;
+
+/// TODO
+pub const RESTRICTED_BLOCK_HEADER_RANGE: u64 = 1000;
+
+/// TODO
+pub const RESTRICTED_TRANSACTIONS_COUNT: usize = 100;
+
+/// TODO
+pub const RESTRICTED_SPENT_KEY_IMAGES_COUNT: usize = 5000;
+
+/// TODO
+pub const RESTRICTED_BLOCK_COUNT: usize = 1000;
+
+/// TODO
+pub const BLOCK_SIZE_SANITY_LEEWAY: usize = 100;
+
+/// TODO
+pub const COMMAND_RPC_GET_BLOCKS_FAST_MAX_BLOCK_COUNT: u64 = 1000;
+
+/// TODO
+pub const COMMAND_RPC_GET_BLOCKS_FAST_MAX_TX_COUNT: u64 = 20_000;
+
+/// TODO
+pub const MAX_RPC_CONTENT_LENGTH: u64 = 1_048_576; // 1 MB
+
+/// TODO
+pub const RPC_IP_FAILS_BEFORE_BLOCK: u64 = 3;
diff --git a/constants/src/sys.rs b/constants/src/sys.rs
new file mode 100644
index 0000000..7ea55ab
--- /dev/null
+++ b/constants/src/sys.rs
@@ -0,0 +1,4 @@
+//! TODO
+
+/// TODO
+pub const THREAD_STACK_SIZE: u64 = 5 * 1024 * 1024;
diff --git a/constants/src/tx.rs b/constants/src/tx.rs
new file mode 100644
index 0000000..10bd806
--- /dev/null
+++ b/constants/src/tx.rs
@@ -0,0 +1,67 @@
+//! TODO
+
+use std::time::Duration;
+
+use crate::{difficulty, macros::monero_definition_link};
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 41)]
+pub const MAX_TX_SIZE: u64 = 1_000_000;
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 42)]
+pub const MAX_TX_PER_BLOCK: u64 = 0x10000000;
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 44)]
+pub const MINED_MONEY_UNLOCK_WINDOW: u64 = 60;
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 45)]
+pub const CURRENT_TRANSACTION_VERSION: u64 = 2;
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 49)]
+pub const DEFAULT_TX_SPENDABLE_AGE: u64 = 10;
+
+/// TODO
+pub const LOCKED_TX_ALLOWED_DELTA_SECONDS_V1: u64 =
+    difficulty::DIFFICULTY_TARGET_V1.as_secs() * LOCKED_TX_ALLOWED_DELTA_BLOCKS;
+
+/// TODO
+pub const LOCKED_TX_ALLOWED_DELTA_SECONDS_V2: u64 =
+    difficulty::DIFFICULTY_TARGET_V2.as_secs() * LOCKED_TX_ALLOWED_DELTA_BLOCKS;
+
+/// TODO
+pub const LOCKED_TX_ALLOWED_DELTA_BLOCKS: u64 = 1;
+
+/// TODO
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 213)]
+pub const MAX_TX_EXTRA_SIZE: u64 = 1060;
+
+/// Three days.
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 102)]
+///
+/// ```rust
+/// # use cuprate_constants::tx::*;
+/// assert_eq!(MEMPOOL_TX_LIFETIME.as_secs(), 86_400 * 3);
+/// ```
+pub const MEMPOOL_TX_LIFETIME: Duration = Duration::from_secs(86_400 * 3);
+
+/// One week.
+#[doc = monero_definition_link!(a1dc85c5373a30f14aaf7dcfdd95f5a7375d3623, "/src/cryptonote_config.h", 103)]
+///
+/// ```rust
+/// # use cuprate_constants::tx::*;
+/// assert_eq!(MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME.as_secs(), 86_400 * 7);
+/// ```
+pub const MEMPOOL_TX_FROM_ALT_BLOCK_LIVETIME: u64 = 86_400 * 7;
+
+/// TODO
+pub const PER_KB_FEE_QUANTIZATION_DECIMALS: u64 = 8;
+
+/// TODO
+pub const SCALING_2021_FEE_ROUNDING_PLACES: u64 = 2;
+
+/// TODO
+pub const DEFAULT_TXPOOL_MAX_WEIGHT: u64 = 648_000_000; // 3 days at 300000, in bytes
diff --git a/helper/src/constants.rs b/helper/src/constants.rs
deleted file mode 100644
index b77fad1..0000000
--- a/helper/src/constants.rs
+++ /dev/null
@@ -1,22 +0,0 @@
-//! General `const`ants and `static`s.
-//!
-//! `#[no_std]` compatible.
-
-//---------------------------------------------------------------------------------------------------- Commit
-/// The current commit hash of the root Cuprate repository.
-///
-/// # Case & length
-/// It is guaranteed that `COMMIT` will be:
-/// - Lowercase
-/// - 40 characters long (no newline)
-///
-/// ```rust
-/// # use cuprate_helper::constants::*;
-/// assert_eq!(COMMIT.as_bytes().len(), 40);
-/// assert_eq!(COMMIT.to_lowercase(), COMMIT);
-/// ```
-pub const COMMIT: &str = core::env!("COMMIT"); // Set in `helper/build.rs`.
-
-//---------------------------------------------------------------------------------------------------- Tests
-#[cfg(test)]
-mod test {}
diff --git a/helper/src/lib.rs b/helper/src/lib.rs
index de0d955..e0548bb 100644
--- a/helper/src/lib.rs
+++ b/helper/src/lib.rs
@@ -11,9 +11,6 @@ pub mod atomic;
 #[cfg(feature = "cast")]
 pub mod cast;
 
-#[cfg(feature = "constants")]
-pub mod constants;
-
 #[cfg(feature = "fs")]
 pub mod fs;