{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8876c1f1416f04e29dfac784e9480415a75ccb1569aa024e49ad6cba65785c1f",
    "signature": "0xa47d1a4e82f2604d6bf245e6707b0332699612b9b1359c339ac04fcede8ceffa3f348dbba2eb1e1c73862211a81a03791b715e2cdf791e0d2c4a57a7c5be57221c",
    "signer": "0x025eb3697DCc7C20f6B249c18F57d6FF519660a7",
    "userId": "234476329"
  }
}