{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x0af3e0daaae57b1f3ba7da4cbbf4a2198db7516f1a8c439c4b5ec076fb83a079",
    "signature": "0x16ae5f7cc6dd096f70d58a092e39db8c79cdcc950b3ef44a3407bc730fb95c42492f9d4b6ea46f3827412526d1587f0433fadba80216043f32810be6b0f8a82d1c",
    "signer": "0x38EFfF3117d01BF2DC25F4340cDD7f743C4ea789",
    "userId": "545523635"
  }
}