{
  "manageEntity": {
    "action": "Save",
    "entityId": "458290579",
    "entityType": "Track",
    "nonce": "0x7c6b5a4944e949b2e688b76c6af483d278e97ac5562892016375cacbcb0429f6",
    "signature": "0xbd3d0bf7f7b82c8d6a1fafd53ab68466394f4e2eccc48161ca93692230da926e0bd012c58cea7003afd2a68356240799bbf07fb5fce2267249bc2fddaf5fd4091c",
    "signer": "0x4089d1751487aA665C895419F2578a6Cf33BE481",
    "userId": "728155533"
  }
}