{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x64cedaa19741bdf70580086d6afdde3b56dcf05a1b9e9f22b2fdc601fb42accd",
    "signature": "0xd149ea88a582ad8eb008c26dc31782d5b93120bb27d7392ee027350c0b9c4eda14b21b8f21c7da2fac1029273feeeef12f2d7d777ce8896355881d551023db491b",
    "signer": "0x844940D4E9534dA1100b0E9c3eC5D02a4fc0FF1f",
    "userId": "117156175"
  }
}