{
  "manageEntity": {
    "action": "Save",
    "entityId": "746002971",
    "entityType": "Track",
    "nonce": "0xe34ef3427efa6771ae1de9506bff6b253bb3f03f3bf70d8db520033d716442e6",
    "signature": "0x15d688c46dda4593242dcf904dfb44fe82c4953b30e0a74bd0d32c61bc807f2a1766e630b12b6a4602e0167bb48951cbe9f50efa1c4589e475f47ae8f6df48471b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}