{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xe5f7ad2270379646e8a96b25bd38761bb7cb964d456a6a455b97dbdb5d71d942",
    "signature": "0x477f21f0593b50446f7922ac87d03a087d663fafaf54997c5def37bb0edfc8bb2956014a8b12117304f7727ac042b36c50b0c1e8f54ef850c7c48f7bfe8ae1bb1c",
    "signer": "0xd163667714DD20a7de7d09005b0A820B1b11aaa2",
    "userId": "841706200"
  }
}