{
  "manageEntity": {
    "action": "Save",
    "entityId": "830320877",
    "entityType": "Track",
    "nonce": "0x477183efc47fdb00e7b694e37663cbab9c420eed4e4118ce7a7c747c5342c005",
    "signature": "0x9a4e8ed27d809a9a217bbc2ad731ca8949af8a791abd36fc38683de05b3a39097ca8bc39a5860b54fa9857f895e98ffe2125c123902a5b91d1f23b343765bd8f1c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}