diff --git a/src/common.rs b/src/common.rs
index 7f76268..e568b7f 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -54,9 +54,9 @@ pub(crate) use crate::{
   bytes::Bytes, env::Env, error::Error, file_info::FileInfo, file_path::FilePath,
   file_status::FileStatus, files::Files, hasher::Hasher, info::Info, lint::Lint, linter::Linter,
   md5_digest::Md5Digest, metainfo::Metainfo, mode::Mode, node::Node, opt::Opt,
-  piece_length_picker::PieceLengthPicker, platform::Platform, status::Status, style::Style,
-  table::Table, target::Target, torrent_summary::TorrentSummary, use_color::UseColor,
-  verifier::Verifier, walker::Walker,
+  piece_length_picker::PieceLengthPicker, piece_list::PieceList, platform::Platform,
+  sha1_digest::Sha1Digest, status::Status, style::Style, table::Table, target::Target,
+  torrent_summary::TorrentSummary, use_color::UseColor, verifier::Verifier, walker::Walker,
 };
 
 // type aliases
diff --git a/src/hasher.rs b/src/hasher.rs
index 21a36ad..0b574f6 100644
--- a/src/hasher.rs
+++ b/src/hasher.rs
@@ -6,7 +6,7 @@ pub(crate) struct Hasher {
   md5sum: bool,
   piece_bytes_hashed: usize,
   piece_length: usize,
-  pieces: Vec<u8>,
+  pieces: PieceList,
   sha1: Sha1,
 }
 
@@ -15,7 +15,7 @@ impl Hasher {
     files: &Files,
     md5sum: bool,
     piece_length: usize,
-  ) -> Result<(Mode, Vec<u8>), Error> {
+  ) -> Result<(Mode, PieceList), Error> {
     Self::new(md5sum, piece_length).hash_files(files)
   }
 
@@ -24,14 +24,14 @@ impl Hasher {
       buffer: vec![0; piece_length],
       length: 0,
       piece_bytes_hashed: 0,
-      pieces: Vec::new(),
+      pieces: PieceList::new(),
       sha1: Sha1::new(),
       piece_length,
       md5sum,
     }
   }
 
-  fn hash_files(mut self, files: &Files) -> Result<(Mode, Vec<u8>), Error> {
+  fn hash_files(mut self, files: &Files) -> Result<(Mode, PieceList), Error> {
     let mode = if let Some(contents) = files.contents() {
       let files = self.hash_contents(&files.root(), contents)?;
 
@@ -46,7 +46,7 @@ impl Hasher {
     };
 
     if self.piece_bytes_hashed > 0 {
-      self.pieces.extend(&self.sha1.digest().bytes());
+      self.pieces.push(self.sha1.digest().into());
       self.sha1.reset();
       self.piece_bytes_hashed = 0;
     }
@@ -111,7 +111,7 @@ impl Hasher {
         self.piece_bytes_hashed += 1;
 
         if self.piece_bytes_hashed == self.piece_length {
-          self.pieces.extend(&self.sha1.digest().bytes());
+          self.pieces.push(self.sha1.digest().into());
           self.sha1.reset();
           self.piece_bytes_hashed = 0;
         }
diff --git a/src/info.rs b/src/info.rs
index d464383..2ba58a0 100644
--- a/src/info.rs
+++ b/src/info.rs
@@ -17,8 +17,7 @@ pub(crate) struct Info {
     with = "unwrap_or_skip"
   )]
   pub(crate) source: Option<String>,
-  #[serde(with = "serde_bytes")]
-  pub(crate) pieces: Vec<u8>,
+  pub(crate) pieces: PieceList,
   #[serde(flatten)]
   pub(crate) mode: Mode,
 }
diff --git a/src/main.rs b/src/main.rs
index 6872a23..f5bb954 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -76,9 +76,11 @@ mod node;
 mod opt;
 mod path_ext;
 mod piece_length_picker;
+mod piece_list;
 mod platform;
 mod platform_interface;
 mod reckoner;
+mod sha1_digest;
 mod status;
 mod style;
 mod table;
diff --git a/src/md5_digest.rs b/src/md5_digest.rs
index 967ce7b..2e9dc67 100644
--- a/src/md5_digest.rs
+++ b/src/md5_digest.rs
@@ -9,7 +9,7 @@ pub(crate) struct Md5Digest {
 
 impl Md5Digest {
   #[cfg(test)]
-  pub(crate) fn from_hex(hex: &str) -> Md5Digest {
+  pub(crate) fn from_hex(hex: &str) -> Self {
     assert_eq!(hex.len(), 32);
 
     let mut bytes: [u8; 16] = [0; 16];
@@ -19,13 +19,13 @@ impl Md5Digest {
       bytes[n] = u8::from_str_radix(&hex[i..i + 2], 16).unwrap();
     }
 
-    Md5Digest { bytes }
+    Self { bytes }
   }
 }
 
 impl From<md5::Digest> for Md5Digest {
   fn from(digest: md5::Digest) -> Self {
-    Md5Digest { bytes: digest.0 }
+    Self { bytes: digest.0 }
   }
 }
 
diff --git a/src/metainfo.rs b/src/metainfo.rs
index a53489d..f245616 100644
--- a/src/metainfo.rs
+++ b/src/metainfo.rs
@@ -115,9 +115,7 @@ mod tests {
         piece_length: Bytes(16 * 1024),
         source: Some("source".into()),
         name: "foo".into(),
-        pieces: vec![
-          0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-        ],
+        pieces: PieceList::from_pieces(&["abc"]),
         mode: Mode::Single {
           length: Bytes(20),
           md5sum: None,
@@ -147,9 +145,7 @@ mod tests {
         piece_length: Bytes(16 * 1024),
         source: Some("source".into()),
         name: "foo".into(),
-        pieces: vec![
-          0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-        ],
+        pieces: PieceList::from_pieces(&["abc"]),
         mode: Mode::Multiple {
           files: vec![FileInfo {
             length: Bytes(10),
diff --git a/src/opt/torrent/create.rs b/src/opt/torrent/create.rs
index c0f8b21..d314424 100644
--- a/src/opt/torrent/create.rs
+++ b/src/opt/torrent/create.rs
@@ -307,6 +307,10 @@ impl Create {
 
     #[cfg(test)]
     {
+      let deserialized = bendy::serde::de::from_bytes::<Metainfo>(&bytes).unwrap();
+
+      assert_eq!(deserialized, metainfo);
+
       let status = metainfo.verify(&input)?;
 
       if !status.good() {
@@ -683,16 +687,19 @@ mod tests {
 
   #[test]
   fn single_small() {
-    let mut env = environment(&["--input", "foo", "--announce", "http://bar"]);
-    let contents = "bar";
-    fs::write(env.resolve("foo"), contents).unwrap();
+    let mut env = env! {
+      args: ["--input", "foo", "--announce", "http://bar"],
+      tree: {
+        foo: "bar",
+      },
+    };
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    assert_eq!(metainfo.info.pieces, Sha1::from(contents).digest().bytes());
+    assert_eq!(metainfo.info.pieces, PieceList::from_pieces(&["bar"]));
     assert_eq!(
       metainfo.info.mode,
       Mode::Single {
-        length: Bytes(contents.len() as u64),
+        length: Bytes(3),
         md5sum: None,
       }
     )
@@ -714,16 +721,10 @@ mod tests {
     fs::write(env.resolve("foo"), contents).unwrap();
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    let pieces = Sha1::from("b")
-      .digest()
-      .bytes()
-      .iter()
-      .chain(Sha1::from("a").digest().bytes().iter())
-      .chain(Sha1::from("r").digest().bytes().iter())
-      .cloned()
-      .collect::<Vec<u8>>();
-
-    assert_eq!(metainfo.info.pieces, pieces);
+    assert_eq!(
+      metainfo.info.pieces,
+      PieceList::from_pieces(&["b", "a", "r"])
+    );
     assert_eq!(
       metainfo.info.mode,
       Mode::Single {
@@ -740,7 +741,7 @@ mod tests {
     fs::write(env.resolve("foo"), contents).unwrap();
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    assert_eq!(metainfo.info.pieces.len(), 0);
+    assert_eq!(metainfo.info.pieces.count(), 0);
     assert_eq!(
       metainfo.info.mode,
       Mode::Single {
@@ -757,21 +758,23 @@ mod tests {
     fs::create_dir(&dir).unwrap();
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    assert_eq!(metainfo.info.pieces.len(), 0);
+    assert_eq!(metainfo.info.pieces.count(), 0);
     assert_eq!(metainfo.info.mode, Mode::Multiple { files: Vec::new() })
   }
 
   #[test]
   fn multiple_one_file_md5() {
-    let mut env = environment(&["--input", "foo", "--announce", "http://bar", "--md5sum"]);
-    let dir = env.resolve("foo");
-    fs::create_dir(&dir).unwrap();
-    let file = dir.join("bar");
-    let contents = "bar";
-    fs::write(file, contents).unwrap();
+    let mut env = env! {
+      args: ["--input", "foo", "--announce", "http://bar", "--md5sum"],
+      tree: {
+        foo: {
+          bar: "bar",
+        },
+      },
+    };
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    assert_eq!(metainfo.info.pieces, Sha1::from(contents).digest().bytes());
+    assert_eq!(metainfo.info.pieces, PieceList::from_pieces(&["bar"]));
     match metainfo.info.mode {
       Mode::Multiple { files } => {
         assert_eq!(
@@ -789,15 +792,17 @@ mod tests {
 
   #[test]
   fn multiple_one_file_md5_off() {
-    let mut env = environment(&["--input", "foo", "--announce", "http://bar"]);
-    let dir = env.resolve("foo");
-    fs::create_dir(&dir).unwrap();
-    let file = dir.join("bar");
-    let contents = "bar";
-    fs::write(file, contents).unwrap();
+    let mut env = env! {
+      args: ["--input", "foo", "--announce", "http://bar"],
+      tree: {
+        foo: {
+          bar: "bar",
+        },
+      },
+    };
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    assert_eq!(metainfo.info.pieces, Sha1::from(contents).digest().bytes());
+    assert_eq!(metainfo.info.pieces, PieceList::from_pieces(&["bar"]));
     match metainfo.info.mode {
       Mode::Multiple { files } => {
         assert_eq!(
@@ -823,10 +828,7 @@ mod tests {
     fs::write(dir.join("h"), "hij").unwrap();
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    assert_eq!(
-      metainfo.info.pieces,
-      Sha1::from("abchijxyz").digest().bytes()
-    );
+    assert_eq!(metainfo.info.pieces, PieceList::from_pieces(&["abchijxyz"]));
     match metainfo.info.mode {
       Mode::Multiple { files } => {
         assert_eq!(
@@ -1084,7 +1086,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.is_empty()
     );
-    assert_eq!(metainfo.info.pieces, &[]);
+    assert_eq!(metainfo.info.pieces, PieceList::new());
   }
 
   #[test]
@@ -1106,7 +1108,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.len() == 2
     );
-    assert_eq!(metainfo.info.pieces, Sha1::from("abcabc").digest().bytes());
+    assert_eq!(metainfo.info.pieces, PieceList::from_pieces(&["abcabc"]));
   }
 
   #[test]
@@ -1141,7 +1143,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.len() == 0
     );
-    assert_eq!(metainfo.info.pieces, &[]);
+    assert_eq!(metainfo.info.pieces, PieceList::new());
   }
 
   #[test]
@@ -1162,7 +1164,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.len() == 1
     );
-    assert_eq!(metainfo.info.pieces, Sha1::from("abc").digest().bytes());
+    assert_eq!(metainfo.info.pieces, PieceList::from_pieces(&["abc"]));
   }
 
   fn populate_symlinks(env: &Env) {
@@ -1205,7 +1207,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.is_empty()
     );
-    assert_eq!(metainfo.info.pieces, &[]);
+    assert_eq!(metainfo.info.pieces, PieceList::new());
   }
 
   #[test]
@@ -1222,7 +1224,9 @@ Content Size  9 bytes
     populate_symlinks(&env);
     env.run().unwrap();
     let metainfo = env.load_metainfo("foo.torrent");
-    assert_eq!(metainfo.info.pieces, Sha1::from("barbaz").digest().bytes());
+    let mut pieces = PieceList::new();
+    pieces.push(Sha1::from("barbaz").digest().into());
+    assert_eq!(metainfo.info.pieces, pieces);
     match metainfo.info.mode {
       Mode::Multiple { files } => {
         assert_eq!(
@@ -1273,7 +1277,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.is_empty()
     );
-    assert_eq!(metainfo.info.pieces, &[]);
+    assert_eq!(metainfo.info.pieces, PieceList::new());
   }
 
   #[test]
@@ -1306,7 +1310,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.is_empty()
     );
-    assert_eq!(metainfo.info.pieces, &[]);
+    assert_eq!(metainfo.info.pieces, PieceList::new());
   }
 
   #[test]
@@ -1322,7 +1326,9 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.len() == 2
     );
-    assert_eq!(metainfo.info.pieces, Sha1::from("bc").digest().bytes());
+    let mut pieces = PieceList::new();
+    pieces.push(Sha1::from("bc").digest().into());
+    assert_eq!(metainfo.info.pieces, pieces);
   }
 
   #[test]
@@ -1338,7 +1344,9 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.len() == 3
     );
-    assert_eq!(metainfo.info.pieces, Sha1::from("abc").digest().bytes());
+    let mut pieces = PieceList::new();
+    pieces.push(Sha1::from("abc").digest().into());
+    assert_eq!(metainfo.info.pieces, pieces);
   }
 
   #[test]
@@ -1361,7 +1369,9 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.len() == 2
     );
-    assert_eq!(metainfo.info.pieces, Sha1::from("bc").digest().bytes());
+    let mut pieces = PieceList::new();
+    pieces.push(Sha1::from("bc").digest().into());
+    assert_eq!(metainfo.info.pieces, pieces);
   }
 
   #[test]
@@ -1377,7 +1387,7 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.is_empty()
     );
-    assert_eq!(metainfo.info.pieces, &[]);
+    assert_eq!(metainfo.info.pieces, PieceList::new());
   }
 
   #[test]
@@ -1404,7 +1414,9 @@ Content Size  9 bytes
       metainfo.info.mode,
       Mode::Multiple { files } if files.len() == 1
     );
-    assert_eq!(metainfo.info.pieces, Sha1::from("a").digest().bytes());
+    let mut pieces = PieceList::new();
+    pieces.push(Sha1::from("a").digest().into());
+    assert_eq!(metainfo.info.pieces, pieces);
   }
 
   #[test]
diff --git a/src/opt/torrent/show.rs b/src/opt/torrent/show.rs
index d872d92..b5f9a9f 100644
--- a/src/opt/torrent/show.rs
+++ b/src/opt/torrent/show.rs
@@ -50,9 +50,7 @@ mod tests {
         piece_length: Bytes(16 * 1024),
         source: Some("source".into()),
         name: "foo".into(),
-        pieces: vec![
-          0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-        ],
+        pieces: PieceList::from_pieces(&["xyz", "abc"]),
         mode: Mode::Single {
           length: Bytes(20),
           md5sum: None,
@@ -78,8 +76,8 @@ mod tests {
      Created  1970-01-01 00:00:01 UTC
   Created By  created by
       Source  source
-   Info Hash  b7595205a46491b3e8686e10b28efe7144d066cc
-Torrent Size  319 bytes
+   Info Hash  e12253978dc6d50db11d05747abcea1ad03b51c5
+Torrent Size  339 bytes
 Content Size  20 bytes
      Private  yes
     Trackers  Tier 1: announce
@@ -89,7 +87,7 @@ Content Size  20 bytes
               1.1.1.1:16
               [2001:db8:85a3::8a2e:370]:7334
   Piece Size  16 KiB
- Piece Count  1
+ Piece Count  2
   File Count  1
        Files  foo
 ";
@@ -115,14 +113,14 @@ Comment\tcomment
 Created\t1970-01-01 00:00:01 UTC
 Created By\tcreated by
 Source\tsource
-Info Hash\tb7595205a46491b3e8686e10b28efe7144d066cc
-Torrent Size\t319
+Info Hash\te12253978dc6d50db11d05747abcea1ad03b51c5
+Torrent Size\t339
 Content Size\t20
 Private\tyes
 Trackers\tannounce\tb\tc
 DHT Nodes\tx:12\t1.1.1.1:16\t[2001:db8:85a3::8a2e:370]:7334
 Piece Size\t16384
-Piece Count\t1
+Piece Count\t2
 File Count\t1
 Files\tfoo
 ";
@@ -150,9 +148,7 @@ Files\tfoo
         piece_length: Bytes(16 * 1024),
         source: Some("source".into()),
         name: "foo".into(),
-        pieces: vec![
-          0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-        ],
+        pieces: PieceList::from_pieces(&["xyz", "abc"]),
         mode: Mode::Single {
           length: Bytes(20),
           md5sum: None,
@@ -178,8 +174,8 @@ Files\tfoo
      Created  1970-01-01 00:00:01 UTC
   Created By  created by
       Source  source
-   Info Hash  b7595205a46491b3e8686e10b28efe7144d066cc
-Torrent Size  307 bytes
+   Info Hash  e12253978dc6d50db11d05747abcea1ad03b51c5
+Torrent Size  327 bytes
 Content Size  20 bytes
      Private  yes
     Trackers  a
@@ -190,7 +186,7 @@ Content Size  20 bytes
               1.1.1.1:16
               [2001:db8:85a3::8a2e:370]:7334
   Piece Size  16 KiB
- Piece Count  1
+ Piece Count  2
   File Count  1
        Files  foo
 ";
@@ -216,14 +212,14 @@ Comment\tcomment
 Created\t1970-01-01 00:00:01 UTC
 Created By\tcreated by
 Source\tsource
-Info Hash\tb7595205a46491b3e8686e10b28efe7144d066cc
-Torrent Size\t307
+Info Hash\te12253978dc6d50db11d05747abcea1ad03b51c5
+Torrent Size\t327
 Content Size\t20
 Private\tyes
 Trackers\ta\tx\ty\tz
 DHT Nodes\tx:12\t1.1.1.1:16\t[2001:db8:85a3::8a2e:370]:7334
 Piece Size\t16384
-Piece Count\t1
+Piece Count\t2
 File Count\t1
 Files\tfoo
 ";
@@ -251,9 +247,7 @@ Files\tfoo
         piece_length: Bytes(16 * 1024),
         source: Some("source".into()),
         name: "foo".into(),
-        pieces: vec![
-          0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-        ],
+        pieces: PieceList::from_pieces(&["abc"]),
         mode: Mode::Single {
           length: Bytes(20),
           md5sum: None,
@@ -279,7 +273,7 @@ Files\tfoo
      Created  1970-01-01 00:00:01 UTC
   Created By  created by
       Source  source
-   Info Hash  b7595205a46491b3e8686e10b28efe7144d066cc
+   Info Hash  b9cd9cae5748518c99d00d8ae86c0162510be4d9
 Torrent Size  307 bytes
 Content Size  20 bytes
      Private  yes
@@ -316,7 +310,7 @@ Comment\tcomment
 Created\t1970-01-01 00:00:01 UTC
 Created By\tcreated by
 Source\tsource
-Info Hash\tb7595205a46491b3e8686e10b28efe7144d066cc
+Info Hash\tb9cd9cae5748518c99d00d8ae86c0162510be4d9
 Torrent Size\t307
 Content Size\t20
 Private\tyes
diff --git a/src/piece_list.rs b/src/piece_list.rs
new file mode 100644
index 0000000..05a82e1
--- /dev/null
+++ b/src/piece_list.rs
@@ -0,0 +1,118 @@
+use crate::common::*;
+
+#[derive(Debug, PartialEq, Clone)]
+pub(crate) struct PieceList {
+  piece_hashes: Vec<Sha1Digest>,
+}
+
+impl PieceList {
+  pub(crate) fn new() -> Self {
+    Self {
+      piece_hashes: Vec::new(),
+    }
+  }
+
+  pub(crate) fn count(&self) -> usize {
+    self.piece_hashes.len()
+  }
+
+  pub(crate) fn push(&mut self, digest: Sha1Digest) {
+    self.piece_hashes.push(digest);
+  }
+
+  #[cfg(test)]
+  pub(crate) fn from_pieces<I, B>(pieces: I) -> Self
+  where
+    I: IntoIterator<Item = B>,
+    B: AsRef<[u8]>,
+  {
+    Self {
+      piece_hashes: pieces
+        .into_iter()
+        .map(|piece| Sha1::from(piece).digest().into())
+        .collect(),
+    }
+  }
+}
+
+impl Serialize for PieceList {
+  fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+  where
+    S: Serializer,
+  {
+    let mut bytes = Vec::with_capacity(self.piece_hashes.len() * sha1::DIGEST_LENGTH);
+
+    for piece in &self.piece_hashes {
+      bytes.extend_from_slice(&piece.bytes());
+    }
+
+    serde_bytes::Bytes::new(&bytes).serialize(serializer)
+  }
+}
+
+impl<'de> Deserialize<'de> for PieceList {
+  fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
+  where
+    D: Deserializer<'de>,
+  {
+    let bytes = serde_bytes::ByteBuf::deserialize(deserializer)?.into_vec();
+
+    if bytes.len() % Sha1Digest::LENGTH != 0 {
+      return Err(D::Error::custom(format!(
+        "buffer length {} is not a multiple of {}",
+        bytes.len(),
+        sha1::DIGEST_LENGTH
+      )));
+    }
+
+    let piece_hashes = bytes
+      .chunks_exact(Sha1Digest::LENGTH)
+      .map(|chunk| Sha1Digest::from_bytes(chunk.try_into().unwrap()))
+      .collect();
+
+    Ok(Self { piece_hashes })
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+
+  #[test]
+  fn basic() {
+    let mut pieces = PieceList::new();
+    assert_eq!(pieces.count(), 0);
+    pieces.push(Sha1::new().digest().into());
+    assert_eq!(pieces.count(), 1);
+  }
+
+  fn case(pieces: PieceList, want: impl AsRef<[u8]>) {
+    let want = want.as_ref();
+    let have = bendy::serde::to_bytes(&pieces).unwrap();
+    assert_eq!(
+      have,
+      want,
+      "{} != {}",
+      String::from_utf8_lossy(&have),
+      String::from_utf8_lossy(want)
+    );
+
+    let have = bendy::serde::from_bytes::<PieceList>(want).unwrap();
+    assert_eq!(have, pieces);
+  }
+
+  #[test]
+  fn empty() {
+    case(PieceList::new(), "0:");
+  }
+
+  #[test]
+  fn single() {
+    let mut pieces = PieceList::new();
+    pieces.push(Sha1::new().digest().into());
+    case(
+      pieces,
+      b"20:\xda\x39\xa3\xee\x5e\x6b\x4b\x0d\x32\x55\xbf\xef\x95\x60\x18\x90\xaf\xd8\x07\x09",
+    );
+  }
+}
diff --git a/src/sha1_digest.rs b/src/sha1_digest.rs
new file mode 100644
index 0000000..9ac504f
--- /dev/null
+++ b/src/sha1_digest.rs
@@ -0,0 +1,26 @@
+use crate::common::*;
+
+#[derive(Debug, Eq, PartialEq, Copy, Clone)]
+pub(crate) struct Sha1Digest {
+  bytes: [u8; Self::LENGTH],
+}
+
+impl Sha1Digest {
+  pub(crate) const LENGTH: usize = 20;
+
+  pub(crate) fn from_bytes(bytes: [u8; Self::LENGTH]) -> Self {
+    Sha1Digest { bytes }
+  }
+
+  pub(crate) fn bytes(self) -> [u8; Self::LENGTH] {
+    self.bytes
+  }
+}
+
+impl From<sha1::Digest> for Sha1Digest {
+  fn from(digest: sha1::Digest) -> Self {
+    Self {
+      bytes: digest.bytes(),
+    }
+  }
+}
diff --git a/src/torrent_summary.rs b/src/torrent_summary.rs
index d9f4fe9..ff2258b 100644
--- a/src/torrent_summary.rs
+++ b/src/torrent_summary.rs
@@ -154,7 +154,7 @@ impl TorrentSummary {
 
     table.size("Piece Size", self.metainfo.info.piece_length);
 
-    table.row("Piece Count", self.metainfo.info.pieces.len() / 20);
+    table.row("Piece Count", self.metainfo.info.pieces.count());
 
     match &self.metainfo.info.mode {
       Mode::Single { .. } => {
diff --git a/src/verifier.rs b/src/verifier.rs
index c19ca34..262cc2a 100644
--- a/src/verifier.rs
+++ b/src/verifier.rs
@@ -3,7 +3,7 @@ use crate::common::*;
 pub(crate) struct Verifier {
   buffer: Vec<u8>,
   piece_length: usize,
-  pieces: Vec<u8>,
+  pieces: PieceList,
   sha1: Sha1,
   piece_bytes_hashed: usize,
 }
@@ -14,7 +14,7 @@ impl Verifier {
       buffer: vec![0; piece_length],
       piece_bytes_hashed: 0,
       sha1: Sha1::new(),
-      pieces: Vec::new(),
+      pieces: PieceList::new(),
       piece_length,
     }
   }
@@ -34,7 +34,7 @@ impl Verifier {
     }
 
     if hasher.piece_bytes_hashed > 0 {
-      hasher.pieces.extend(&hasher.sha1.digest().bytes());
+      hasher.pieces.push(hasher.sha1.digest().into());
       hasher.sha1.reset();
       hasher.piece_bytes_hashed = 0;
     }
@@ -65,7 +65,7 @@ impl Verifier {
         self.piece_bytes_hashed += 1;
 
         if self.piece_bytes_hashed == self.piece_length {
-          self.pieces.extend(&self.sha1.digest().bytes());
+          self.pieces.push(self.sha1.digest().into());
           self.sha1.reset();
           self.piece_bytes_hashed = 0;
         }