{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xa9b66c01e79d24ed3797eea5f24b00ab505ba8f961932ed02e00715fb5e5b798",
    "signature": "0x483669ab84d8e2ca0bbcb9acbd4c4186351823d1e14d45a475e2583fe0ecec137595a2f00ed8346eec5004f4f44f3a7d387101d4b5086ecd22cf425f8762e58b1b",
    "signer": "0xD9A81296607A057616D2BdFEAa51375208b7fbc3",
    "userId": "343798350"
  }
}