{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x81fbfd4914c0e9bc835a397fb67ef61d4eb6650e1db43541f04c38862453d81c",
    "signature": "0xb135c0a37cbaa4b0798c68aea4f5f3d55f82fc277a88b4cfe2c95cc3cd62441b06f2b4a0e92b0e2fe40d4f529c2603e71db26e9a698e03e5af46f083407ea3361b",
    "signer": "0x7FCffbc9FB7516A6453F59c5b9918Ea8A7EB33eb",
    "userId": "502388335"
  }
}