{
  "manageEntity": {
    "action": "Save",
    "entityId": "603832658",
    "entityType": "Track",
    "nonce": "1791411229849657550",
    "signature": "0x390fa12cf559b205616bda44c19e1202f15fecb665917415b2725c9c1e22278e167a9f48fffcb7bb6f401ff642cf0e0c741a7c9dd9ff3618133ec076acea3c301b",
    "signer": "0x8fd715e47Ad50D04fA39A9bc8068e9f5304fbD2f",
    "userId": "152482938"
  }
}