@Aljoscha

i didn't find any non-canonicals:

var Client = require('ssb-client')
var pull = require('pull-stream')

Client((err, client) => {
  if (err) throw err

  pull(
    client.createLogStream(),
    pull.drain(
      check_msg,
      (err) => {
        if (err) throw err
        client.close()
      }
    )
  )
})


function check_msg(msg) {
  if (msg.value.previous != null && !is_canonic(msg.value.previous.slice(1, 45))) {
    throw `non-canonic previous: ${key}`;
  }

  if (!is_canonic(msg.value.author.slice(1, 45))) {
    throw `non-canonic author: ${key}`;
  }

  if (!is_canonic(msg.value.signature.slice(0, 88))) {
    throw `non-canonic signature: ${key}`
  }

  if (typeof msg.value.content === "string" && !is_canonic(msg.value.content.slice(0, msg.value.content.indexOf(".box")))) {
    throw `non-canonic private message: ${key}`
  }
}

function is_canonic(str) {
  return Buffer.from(str, "base64").toString("base64") === str;
}

took 23.24s user 5.16s system 43% cpu 1:05.70 total time