{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x5669b0cf281e2b02210473dadb87cb00e97bf1fe493ab6f2972872076f72f6af",
    "signature": "0xd40f3aaf7b2dd290e0344f9f1a41c9bf8d7ad7b08c92a120cd71a2e0e5c0add92f6af7ef18a6bfbeae9fb5f9a64db28b0f20cffa0840463d88536af5f57f06051c",
    "signer": "0x821BB2f6A70e52ceb0794E8734c44fa97F6a26cF",
    "userId": "754605509"
  }
}