{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9dd3f4269f558d7df5303ae453dfbfefa19880ae993e3e0aa96b5ff3002c2081",
    "signature": "0x61ca3cfc0ca30ea1ae0e940dd7469157d1d8f0c206a77ea9969fef06332714d43a3a1243e3ae1aa7cbd87b0ecf07a1cf38f29adbbc220c35901a7acf70cbedf81c",
    "signer": "0xB38C5790DCe67E8dFc44f974540228aBF50B6356",
    "userId": "189717523"
  }
}