{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x2d253eea1715c22c22f61f8609dc1593546e41adabd8258727eb1c4a93c8a266",
    "signature": "0x3eb1b1abddbb676039af8b5eb15d951f2915a8f68856ee31f175a0a96a19bd0c3443c95d54e7cc071aa3c2b68c4bd2cc9c5daf56ba384b6a580f5d7b80efc31a1b",
    "signer": "0x1cdFf70c3148938298C2f37555e69D65C18D364b",
    "userId": "356982132"
  }
}