{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xb3aecbe615e874e1cfbb0a094ab780baf75b9fc125f6ea42de598b3914c75ae0",
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    "signer": "0x15cadb81ec3D0FcF723Bf618c9848aDef84c807B",
    "userId": "532441510"
  }
}