{
  "manageEntity": {
    "action": "Save",
    "entityId": "671563544",
    "entityType": "Track",
    "nonce": "0xd7376bb03baf72a255ef4dc6d71fe4feecfc3592d136d67bd4903d2dfcffb018",
    "signature": "0x81217f37a6a04c7c2e210a2b93c4d49c5b72e823c3143d6ff9bc14b79e4bf87268042ed937e7e94db2b91674fb740c05554942fb11f3442f23782bdd93f3fcb01c",
    "signer": "0x06Ad5789cE045C5B0AeB97849051a7385CA95B4a",
    "userId": "270209897"
  }
}