{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa11ff73bb66362b826a2a0f400a0dcb00df75f8ffe855dea0992ea2e1c30fdfa",
    "signature": "0x81ed7bc947d5dbbacaf9901b7727528325ca6b56423adac40bd970c19a80561829b2aad9da80a6fb8d41848228e85f8ed644bd24c0f5375c44e78c9ed9cc384e1c",
    "signer": "0x407d98945f6A21AD4BF7108Ce0DDA86617037967",
    "userId": "287065927"
  }
}