{
  "manageEntity": {
    "action": "Save",
    "entityId": "426443",
    "entityType": "Track",
    "nonce": "0x933f07422080b0b17bd9e674362eda7b5448b3e8beee16f1f99e0847604b13b0",
    "signature": "0x3247c25d2c512e25c47eb775aeb1931f79583648362e16d4596a5eac076ef65c79578263205b34a74679eafb57893679d9f3a938c05a13937462741afbb399091b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}