{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x638dcd398d51c9e4b289eb8a365ce9b58e438236b7c0f1658bde9950ac6dc040",
    "signature": "0xa1eb9651073edd171e5c811f0d39f3e5768eca09dddb705ac25435bdc24bc8c10e6d5120a5cb92903d48352b5ff9529b0565daadbcc69269a418fa3cdb3145181c",
    "signer": "0x8c83aB7F6a7f7A93A7CeFeF6E16b212bA43529f5",
    "userId": "549340592"
  }
}