message_compound.json

{
    "channel": "#slackblocks",
    "mrkdwn": true,
    "blocks": [
        {
            "type": "section",
            "block_id": "fake_block1",
            "text": {
                "type": "mrkdwn",
                "text": "Block, One"
            }
        },
        {
            "type": "image",
            "block_id": "fake_block3",
            "image_url": "http://bit.ly/slack-block-test-image",
            "alt_text": "crash",
            "title": {
                "type": "plain_text",
                "text": " "
            }
        }
    ],
    "attachments": [
        {
            "blocks": [
                {
                    "type": "section",
                    "block_id": "fake_block1",
                    "text": {
                        "type": "mrkdwn",
                        "text": "Block, One"
                    }
                }
            ],
            "color": "#8800ff"
        },
        {
            "blocks": [
                {
                    "type": "section",
                    "block_id": "fake_block2",
                    "text": {
                        "type": "mrkdwn",
                        "text": "Block, Two"
                    }
                },
                {
                    "type": "image",
                    "block_id": "fake_block3",
                    "image_url": "http://bit.ly/slack-block-test-image",
                    "alt_text": "crash",
                    "title": {
                        "type": "plain_text",
                        "text": " "
                    }
                }
            ],
            "color": "#ffff00"
        }
    ],
    "text": ""
}