{
  "manageEntity": {
    "action": "Save",
    "entityId": "254967674",
    "entityType": "Track",
    "nonce": "0x718fd2889350ab31d5e557c1cd959eb4aa7c40505d56b8bf323d1a9165413534",
    "signature": "0xf4e95d65b1a84e60ceb4a433e0b935a37b7d7ab4a69df9219b629e22d6050df35ffabdfd93baef004957f2c14f90fa5416a2703c8b4dbe71b3bfd2352c20cd861b",
    "signer": "0x5ED46E41387B4d8a2fc3cae6eBb7D76BE8b09c15",
    "userId": "971831429"
  }
}