{
  "manageEntity": {
    "action": "Save",
    "entityId": "349877",
    "entityType": "Track",
    "nonce": "0x9215deaf947dc8d64eb1f33cb93ada87e14d057fa3956245a88af4383449946c",
    "signature": "0xc7fc34490346814f7c0e5669eb935dc9486576eb1a23d3937814a798d2a80ded3951d93c69f3cfec42c38befcdc9faf1f7b705397c7b4294b0e10cdc15ea75991c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}