diff --git a/blockset/src/app.rs b/blockset/src/app.rs
index 4b71dd0b..2c6ba7b7 100644
--- a/blockset/src/app.rs
+++ b/blockset/src/app.rs
@@ -1,7 +1,7 @@
 use crate::{
     base32::{StrEx, ToBase32},
-    digest224::Digest224,
     io::Io,
+    u224::U224,
 };
 
 pub fn run(io: &mut impl Io) -> Result<(), &str> {
@@ -11,7 +11,7 @@ pub fn run(io: &mut impl Io) -> Result<(), &str> {
     match command.as_str() {
         "validate" => {
             let b32 = a.next().ok_or("missing address")?;
-            let d = b32.from_base32::<Digest224>().ok_or("invalid address")?;
+            let d = b32.from_base32::<U224>().ok_or("invalid address")?;
             io.print("valid: ");
             io.println(&d.to_base32());
             Ok(())
diff --git a/blockset/src/lib.rs b/blockset/src/lib.rs
index 0a82e4f9..11bcb87f 100644
--- a/blockset/src/lib.rs
+++ b/blockset/src/lib.rs
@@ -2,14 +2,14 @@ mod app;
 mod ascii;
 mod base32;
 mod bit_vec;
-mod digest224;
 mod io;
 mod overflow32;
 mod sha224;
 mod sigma32;
-mod u32x16;
-mod u32x4;
-mod u32x8;
+mod u128;
+mod u224;
+mod u256;
+mod u512;
 
 #[cfg(test)]
 mod static_assert;
diff --git a/blockset/src/sha224.rs b/blockset/src/sha224.rs
index b7022874..37c6c51a 100644
--- a/blockset/src/sha224.rs
+++ b/blockset/src/sha224.rs
@@ -1,9 +1,10 @@
 use crate::{
     overflow32::{add, add3, add4},
     sigma32::{BIG0, BIG1, SMALL0, SMALL1},
-    u32x16::U512,
-    u32x4::{get_u32, to_u128, to_u32x4},
-    u32x8::{u32x8_add, U256},
+    u128::{from_u32x4, get_u32, to_u32x4},
+    u224::U224,
+    u256::{to_u32x8, u32x8_add, U256},
+    u512::U512,
 };
 
 const fn round([s0, s1]: U256, i: usize, w: u128, k: u128) -> U256 {
@@ -94,7 +95,7 @@ const fn w_round4(w: &U512, i: usize) -> u128 {
     w0[1] = w_round(w0[1], w0[2], w22, w33);
     w0[2] = w_round(w0[2], w0[3], w23, w0[0]);
     w0[3] = w_round(w0[3], w10, w30, w0[1]);
-    to_u128(w0)
+    from_u32x4(w0)
 }
 
 const fn w_round16(mut w: U512) -> U512 {
@@ -110,7 +111,7 @@ pub const INIT: U256 = [
     0xbefa4fa4_64f98fa7_68581511_ffc00b31,
 ];
 
-pub const fn compress(mut w: U512) -> U256 {
+pub const fn compress(mut w: U512) -> U224 {
     let mut x: U256 = INIT;
     x = round16(x, &w, 0);
     w = w_round16(w);
@@ -120,24 +121,23 @@ pub const fn compress(mut w: U512) -> U256 {
     w = w_round16(w);
     x = round16(x, &w, 3);
     x = u32x8_add(&x, &INIT);
-    x[1] |= 0xFFFF_FFFF << 96;
-    x
+    let [x0, x1, x2, x3, x4, x5, x6, _] = to_u32x8(&x);
+    [x0, x1, x2, x3, x4, x5, x6]
 }
 
 #[cfg(test)]
 mod test {
-    use super::{compress, U256};
+    use crate::u224::U224;
 
-    const A: U256 = compress([0x8000_0000, 0, 0, 0]);
+    use super::compress;
+
+    const A: U224 = compress([0x8000_0000, 0, 0, 0]);
 
     #[test]
     fn test() {
         assert_eq!(
             A,
-            [
-                0x288234c4_476102bb_2a3a2bc9_d14a028c,
-                0xFFFFFFFF_c5b3e42f_828ea62a_15a2b01f
-            ]
+            [0xd14a028c, 0x2a3a2bc9, 0x476102bb, 0x288234c4, 0x15a2b01f, 0x828ea62a, 0xc5b3e42f]
         );
     }
 
@@ -145,10 +145,7 @@ mod test {
     fn runtime_test() {
         assert_eq!(
             compress([0x8000_0000, 0, 0, 0]),
-            [
-                0x288234c4_476102bb_2a3a2bc9_d14a028c,
-                0xFFFFFFFF_c5b3e42f_828ea62a_15a2b01f
-            ]
+            [0xd14a028c, 0x2a3a2bc9, 0x476102bb, 0x288234c4, 0x15a2b01f, 0x828ea62a, 0xc5b3e42f]
         );
     }
 }
diff --git a/blockset/src/u32x4.rs b/blockset/src/u128.rs
similarity index 80%
rename from blockset/src/u32x4.rs
rename to blockset/src/u128.rs
index 161f406b..eded843b 100644
--- a/blockset/src/u32x4.rs
+++ b/blockset/src/u128.rs
@@ -11,7 +11,7 @@ pub const fn to_u32x4(v: u128) -> [u32; 4] {
 }
 
 #[inline(always)]
-pub const fn to_u128([w0, w1, w2, w3]: [u32; 4]) -> u128 {
+pub const fn from_u32x4([w0, w1, w2, w3]: [u32; 4]) -> u128 {
     w0 as u128 | ((w1 as u128) << 32) | ((w2 as u128) << 64) | ((w3 as u128) << 96)
 }
 
@@ -24,5 +24,5 @@ pub const fn get_u32(v: u128, i: usize) -> u32 {
 pub const fn u32x4_add(a: u128, b: u128) -> u128 {
     let [a0, a1, a2, a3] = to_u32x4(a);
     let [b0, b1, b2, b3] = to_u32x4(b);
-    to_u128([add(a0, b0), add(a1, b1), add(a2, b2), add(a3, b3)])
+    from_u32x4([add(a0, b0), add(a1, b1), add(a2, b2), add(a3, b3)])
 }
diff --git a/blockset/src/digest224.rs b/blockset/src/u224.rs
similarity index 94%
rename from blockset/src/digest224.rs
rename to blockset/src/u224.rs
index 858a76c3..10bf0c4e 100644
--- a/blockset/src/digest224.rs
+++ b/blockset/src/u224.rs
@@ -5,19 +5,19 @@ use crate::{
     bit_vec::BitVec,
 };
 
-pub type Digest224 = [u32; 7];
+pub type U224 = [u32; 7];
 
-pub trait Digest224Ex {
+pub trait U224Ex {
     fn parity_bit(self) -> u8;
 }
 
-impl Digest224Ex for &Digest224 {
+impl U224Ex for &U224 {
     fn parity_bit(self) -> u8 {
         self.iter().fold(0, |a, b| a ^ b.count_ones()) as u8 & 1
     }
 }
 
-impl ToBase32 for &Digest224 {
+impl ToBase32 for &U224 {
     fn to_base32(self) -> String {
         let (result, BitVec { value, len }) = self
             .iter()
@@ -31,7 +31,7 @@ impl ToBase32 for &Digest224 {
     }
 }
 
-impl FromBase32 for Digest224 {
+impl FromBase32 for U224 {
     fn from_base32(i: &str) -> Option<Self> {
         let (vec, BitVec { value, len }) = i.from_base32()?;
         if vec.len() != 7 {
@@ -39,7 +39,7 @@ impl FromBase32 for Digest224 {
         }
         assert_eq!(len, 1);
         assert_eq!(value | 1, 1);
-        let mut result = Digest224::default();
+        let mut result = U224::default();
         result.copy_from_slice(&vec);
         if value != result.parity_bit() as u64 {
             return None;
@@ -52,7 +52,7 @@ impl FromBase32 for Digest224 {
 mod tests {
     use crate::{
         base32::{StrEx, ToBase32},
-        digest224::{Digest224, Digest224Ex},
+        u224::{U224Ex, U224},
     };
 
     #[test]
@@ -219,12 +219,12 @@ mod tests {
 
     #[test]
     fn invalid_str_test() {
-        assert_eq!("01".from_base32::<Digest224>(), None);
+        assert_eq!("01".from_base32::<U224>(), None);
         assert!("3v1d4j94scaseqgcyzr0ha5dxa9rx6ppnfbndck971ac0"
-            .from_base32::<Digest224>()
+            .from_base32::<U224>()
             .is_none());
         assert!("1v1d4j94scaseqgcyzr0ha5dxa9rx6ppnfbndck971ac0"
-            .from_base32::<Digest224>()
+            .from_base32::<U224>()
             .is_some());
     }
 }
diff --git a/blockset/src/u256.rs b/blockset/src/u256.rs
new file mode 100644
index 00000000..fc0708fd
--- /dev/null
+++ b/blockset/src/u256.rs
@@ -0,0 +1,14 @@
+use crate::u128::{to_u32x4, u32x4_add};
+
+pub type U256 = [u128; 2];
+
+#[inline(always)]
+pub const fn u32x8_add(&[a0, a1]: &U256, &[b0, b1]: &U256) -> U256 {
+    [u32x4_add(a0, b0), u32x4_add(a1, b1)]
+}
+
+pub const fn to_u32x8([a, b]: &U256) -> [u32; 8] {
+    let [a0, a1, a2, a3] = to_u32x4(*a);
+    let [b0, b1, b2, b3] = to_u32x4(*b);
+    [a0, a1, a2, a3, b0, b1, b2, b3]
+}
diff --git a/blockset/src/u32x8.rs b/blockset/src/u32x8.rs
deleted file mode 100644
index 8dacafc2..00000000
--- a/blockset/src/u32x8.rs
+++ /dev/null
@@ -1,8 +0,0 @@
-use crate::u32x4::u32x4_add;
-
-pub type U256 = [u128; 2];
-
-#[inline(always)]
-pub const fn u32x8_add(&[a0, a1]: &U256, &[b0, b1]: &U256) -> U256 {
-    [u32x4_add(a0, b0), u32x4_add(a1, b1)]
-}
diff --git a/blockset/src/u32x16.rs b/blockset/src/u512.rs
similarity index 100%
rename from blockset/src/u32x16.rs
rename to blockset/src/u512.rs