unit:
{
  "_id": "5a91790599a77113e050a284",
  "_meta": {
    "fullName": "AdEx unit 1",
    "createdOn": 1519483140672,
    "owner": "0xb13bf2a078bf328b6c72d53129cdc61c940f4642",
    "type": 0,
    "img": {
      "ipfs": "QmfPHj3H8ZLfam7nCccj2SNVNMbU7iMZGBX4APu4ZMGe57"
    },
    "size": 1,
    "adType": 1,
    "banner": null,
    "ad_url": "https://adex.network",
    "targets": [
      {
        "name": "gender",
        "value": [],
        "weight": 0
      },
      {
        "name": "location",
        "value": [],
        "weight": 0
      },
      {
        "name": "age",
        "value": {
          "from": 0,
          "to": 100
        },
        "weight": 0
      }
    ]
  },
  "_ipfs": "QmUepXrhahvNHfQfJNNmzxkDRCyMxBjeMHQgXDNjdqy2tm",
  "_modifiedOn": null,
  "_deleted": false,
  "_archived": false,
  "_type": 0,
  "_items": [
    "5a92dc93950b5d0354e9244a"
  ],
  "_description": "AdEx test unit 1",
  "_createdOn": 1519483140672,
  "user": "0xb13bf2a078bf328b6c72d53129cdc61c940f4642",
  "sizeAndType": 11
}
placedBid:
{
  "_id": "0x2f8cf124e779e0d83054ce7d5472292b14109c9d8ae427d6b9e7410eb3d71deb",
  "_state": 0,
  "_advertiser": "0xb13bf2a078bf328b6c72d53129cdc61c940f4642",
  "_adUnit": "QmUepXrhahvNHfQfJNNmzxkDRCyMxBjeMHQgXDNjdqy2tm",
  "_adUnitId": "5a91790599a77113e050a284",
  "_publisher": "",
  "_adSlot": "",
  "_adSlotId": "",
  "_acceptedTime": 0,
  "_amount": "1500",
  "_target": 15,
  "_timeout": 7776000,
  "_publisherConfirmation": "",
  "_advertiserConfirmation": "",
  "sizeAndType": 11,
  "_opened": 1519569437575,
  "_signature": {
    "sig_mode": 0,
    "signature": "0x16be8d9fb3b08bb09dff06718c3815143461103dd28dc08e8ab73345325c36c876046255b50ba056bb9ed9a8356966fde766e2d0bd61ab67702bf086a0bc56101b",
    "hash": "0x2f8cf124e779e0d83054ce7d5472292b14109c9d8ae427d6b9e7410eb3d71deb",
    "r": "0x16be8d9fb3b08bb09dff06718c3815143461103dd28dc08e8ab73345325c36c8",
    "s": "0x76046255b50ba056bb9ed9a8356966fde766e2d0bd61ab67702bf086a0bc5610",
    "v": 27
  },
  "_exchangeAddr": "0x912b8f85E28B9ec196b48228159E2f13546836e6",
  "clicksCount": 0,
  "createdOn": 1519569485629,
  "unconfirmedStateId": 0,
  "unconfirmedStateTrHash": null,
  "unconfirmedStateTime": 0,
  "confirmedEvents": []
}
slot:
{
  "_meta": {
    "fullName": "Adex slot 1",
    "createdOn": 1519483534409,
    "owner": "0x0f8302dfa3faedc5736d2094691f054b9d7cbf99",
    "type": 1,
    "img": {
      "ipfs": "QmZpgzScjqamTUx8uNctMATX6Bf4SBCcK9Tzp6tjrU1Jgg"
    },
    "size": 1,
    "adType": 1
  },
  "_ipfs": "QmcXGyvtchyD5G6wU95FjA1gceLjtq484JQiEFLotAHL9i",
  "_deleted": false,
  "_archived": false,
  "_type": 1,
  "_id": "5a917a8f99a77113e050a285",
  "_items": [],
  "_description": "Adex Slot 1",
  "_fallbackAdImg": {
    "ipfs": "QmTVkHn4avoqPEwXxvazMMwiRrjmADNcZztBfXUpTvHyvt"
  },
  "_fallbackAdUrl": "https://adex.network"
}