{
  "manageEntity": {
    "action": "Save",
    "entityId": "1657951578",
    "entityType": "Track",
    "nonce": "0xfc43b3c7c6244893994599ae84d03b0a64f40d402076840ea0c151fa97d2c7f7",
    "signature": "0x77ed51051b9e9b48db3a9393ab4c8fa3218a194952ed256a3e5e6b06ca747f9200f0b4e393bd2419a481e4fa7656e1cd64d9d7bc90cc20372ed7aad488cb32121b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}