{
  "manageEntity": {
    "action": "Save",
    "entityId": "375678",
    "entityType": "Track",
    "nonce": "0x0b22c27f0efb030b2b37d33ccdff5accc72ea9164472ffd3f754fe40a314780a",
    "signature": "0xefe0b5d6e64dd58b5e9ec95854c82dc235532ab4f5c0ed0e9b1c88a335f22aa329a6cb3829e23ba3fa6d7ce14246fffb1bc47246ed03b8102ad8eacc9c27045a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}