{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x007339575c35073b32229ec41554c5f3f7df2e77703197f5d652e725da028d06",
    "signature": "0x8b45047657d9db4a15cd4b00e333991b3fb93b74ad4b6fe8bb6572a3bc03b73623567b4c0599462bb4f154e539fc8cccd6bf126f5a00f640083d3fe8482c94c61c",
    "signer": "0xa031396B4a7515E03E7c99A90D7f53b4C887E66A",
    "userId": "473445519"
  }
}