{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5b6dd27d6aecfbf34aac150ebc629ae5880ccba974f7d62550c80589740c7cfe",
    "signature": "0x4bde662ba0d03cbfb6c0a1d696e46e89f5d287b15f3ad73fe463fbabb1c7db9c40eca8b1341904367569c3566ac83a8c8dea48837c377e0d89e49db8f61b9cda1c",
    "signer": "0x2E13a23B80c933b6624801750ADD8Ec151eDaE05",
    "userId": "377244720"
  }
}