{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x8ee88b37847a2f4af1cd0f702adedba6f5401ebbe90c27bb20ea8c1434272cc9",
    "signature": "0xa947d91b2650aa0d590dfc53a4c69cca1a228744c32f5caf13482729f040063541845438e3b8bf2b4e9072fa0cd357331d529b11b0ff6424ae4c6ed23e4985541b",
    "signer": "0x135f87aF624548aC3904b2C7aC49aBD8391D5021",
    "userId": "747399081"
  }
}