{
  "manageEntity": {
    "action": "Save",
    "entityId": "868578434",
    "entityType": "Track",
    "nonce": "0xbc8a1bfd7059ac7d02f4b6cb556fb95c499659afc61e32ea12a1e2d10d7b5be9",
    "signature": "0xa1614fd8e2d1f0455ce8c7fe085f26ac6dd19bd009767efe2e81cb5f8ecfa2552fd2e4bafb6a79b9ac88b24f9fbf450e572c52673049a806816d602f988e74091c",
    "signer": "0xC9e4fe89311517E71e968f6DE26A6c075A639F41",
    "userId": "964899801"
  }
}