{
  "manageEntity": {
    "action": "Save",
    "entityId": "442820463",
    "entityType": "Track",
    "nonce": "0x390f30e15debb3497b3e56a4efc78a482ab5f3a1c28a45cbc2664d8ebb3ac8b6",
    "signature": "0x8651a110ef59902f29309e80f2a2f7c2017aae884ecfc25fd80991beef193a484b72d0ba4770587ca63bd81a2dafd8536c1be32b4d39a49f496c6eab03636d581c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}