{
  "manageEntity": {
    "action": "Save",
    "entityId": "1662580067",
    "entityType": "Track",
    "nonce": "0x3152d328f75bc53d8252e91d567a633163d87cc559a7507b61708abe6f5be84a",
    "signature": "0xcaf9d208457108569214aa9e83ec9b8a9537cf80944c958a7129decb4c1f038b0cfa5f3367ff7001feaf4bca4851f5f59e9eb33717aea85cd518808b428c3a9f1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}