{
  "manageEntity": {
    "action": "Save",
    "entityId": "476830144",
    "entityType": "Track",
    "nonce": "0x4fb4a4dc15d6f22e6982dd504b55b9e8639329a372aa261a56cf43af1afac4ee",
    "signature": "0xf0628040e4e48be4fa6dc0be4069aecca56cecd6d319152f3d13c0b3d0dd165c07904eae7219d4f521a6a93b6fe8a4f5c78a40c865194fefb74d3ba83737ce411c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}