{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xcb5d21c7c35e9bb74c1bea911c1abe32eb1ead1cda4a19a0cf801bce5de240e9",
    "signature": "0x1530e5b6eecfdc9dd326d804f61aa99f207b0a903abaac306c49c23777f784b86d480ea0945fb54194e4395be2d6aac28f36adbae94aacbf4390dfb516c9c2b31c",
    "signer": "0x0FFf69aAa5C477973508e64c5cC9E5948d1Dc65a",
    "userId": "901483974"
  }
}