{
  "manageEntity": {
    "action": "Save",
    "entityId": "664790119",
    "entityType": "Track",
    "nonce": "0xcf7e09bee1cb59f04aa31bf720df7a2505904874ae64f7e78ac914991a17a967",
    "signature": "0x34ef553f894f58999da9541bd3fda7af0faa51064ac752e664b57ea8736a62be6761deaa929aa6e3e01c6e23637d65e4ded62df9b88ce4fa2fbc0dd6ef9a4a661c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}