{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x4c12a54e4fd4e1966747699c14b7e351cad657240ca452b66a040f43bd4cf96e",
    "signature": "0x2960722af8d9baaab3624238027ae27dd8e0d395fab9918d3ff402dbd3fa3a4824d8de0fe8768156134956ee07196654bcc537fbf965dcd07981e910aaa4391e1c",
    "signer": "0x3CcDf5580dCb03a0425f7DCe6a10B25B4Cf46DaA",
    "userId": "279730760"
  }
}