tsv: &str,
) -> Result<Vec<(OutPoint, &str)>> {
  let mut needles = Vec::new();
  for (i, line) in tsv.lines().enumerate() {
    if line.is_empty() || line.starts_with('#') {
      continue;
    }

    if let Some(value) = line.split('\t').next() {
      let sat = Sat::from_str(value).map_err(|err| {
        anyhow!(
          "failed to parse sat from string \"{value}\" on line {}: {err}",
          i + 1,
        )
      })?;

      needles.push((sat, value));
    }
  }
  needles.sort();

  let mut haystacks = utxos
    .into_iter()
    .flat_map(|(outpoint, ranges)| {
      ranges
        .into_iter()
        .map(move |(start, end)| (start, end, outpoint))
    })
    .collect::<Vec<(u64, u64, OutPoint)>>();
  haystacks.sort();

  let mut i = 0;
  let mut j = 0;
  let mut results = Vec::new();
  while i < needles.len() && j < haystacks.len() {
    let (needle, value) = needles[i];
    let (start, end, outpoint) = haystacks[j];

    if needle >= start && needle < end {
      results.push((outpoint, value));