Twig array key errors

Question

I'm dumping this var but cant nail down this error:

{% set submissions = craft.tumblr.submissions %}
<ul>
    {% for key,submits in submissions %}
        // KEY GIVES ERROR 1
        <li>{{ dump(submits.key)  }}</li>
        <hr>
        // BLOG_NAME GIVES ERROR 2
        <li>{{ dump(submits.blog_name)  }}</li>
    {% endfor %}
</ul>

Error 1:

Key "key" for array with keys "blog_name, id, post_url, slug, type, date, timestamp, state, format, reblog_key, short_url, summary, recommended_source, recommended_color, followed, is_anonymous, anonymous_name, anonymous_email, is_submission, liked, note_count, title, url, link_author, excerpt, publisher, can_send_in_message, can_reply" does not exist

Error 2:

Method "blog_name" for object "Twig_Markup" does not exist

Thoughts?

EDIT: Adding scheme for craft.tumblr.submissions:

array(7) {
  [1]=>
  array(28) {
    ["blog_name"]=>
    array(1) {
      [0]=>
      string(11) ""
    }
    ["id"]=>
    array(1) {
      [0]=>
      int()
    }
    ["post_url"]=>
    array(1) {
      [0]=>
      string(64) ""
    }
    ["slug"]=>
    array(1) {
      [0]=>
      string(23) ""
    }
    ["type"]=>
    array(1) {
      [0]=>
      string(4) ""
    }
    ["date"]=>
    array(1) {
      [0]=>
      string(23) ""
    }
    ["timestamp"]=>
    array(1) {
      [0]=>
      int()
    }
    ["state"]=>
    array(1) {
      [0]=>
      string(10) ""
    }
    ["format"]=>
    array(1) {
      [0]=>
      string(4) ""
    }
    ["reblog_key"]=>
    array(1) {
      [0]=>
      string(8) ""
    }
    ["short_url"]=>
    array(1) {
      [0]=>
      string(30) ""
    }
    ["summary"]=>
    array(1) {
      [0]=>
      string(23) ""
    }
    ["recommended_source"]=>
    array(1) {
      [0]=>
      string(11) ""
    }
    ["recommended_color"]=>
    array(1) {
      [0]=>
      string(11) ""
    }
    ["followed"]=>
    array(1) {
      [0]=>
      bool(false)
    }
    ["is_anonymous"]=>
    array(1) {
      [0]=>
      bool(true)
    }
    ["anonymous_name"]=>
    array(1) {
      [0]=>
      string(13) ""
    }
    ["anonymous_email"]=>
    array(1) {
      [0]=>
      string(30) ""
    }
    ["is_submission"]=>
    array(1) {
      [0]=>
      bool(true)
    }
    ["liked"]=>
    array(1) {
      [0]=>
      bool(false)
    }
    ["note_count"]=>
    array(1) {
      [0]=>
      int(0)
    }
    ["title"]=>
    array(1) {
      [0]=>
      string(23) ""
    }
    ["url"]=>
    array(1) {
      [0]=>
      string(54) ""
    }
    ["link_author"]=>
    array(1) {
      [0]=>
      string(11) ""
    }
    ["excerpt"]=>
    array(1) {
      [0]=>
      string(11) ""
    }
    ["publisher"]=>
    array(1) {
      [0]=>
      string(11) ""
    }
    ["can_send_in_message"]=>
    array(1) {
      [0]=>
      bool(false)
    }
    ["can_reply"]=>
    array(1) {
      [0]=>
      bool(true)
    }
  }
  [2]=>

Answer 1

I'm not sure what submissions is, but submits inside your loop is an array so you can access its values using submits['blog_name'].