{
  "manageEntity": {
    "action": "Save",
    "entityId": "754849378",
    "entityType": "Track",
    "nonce": "0x327e9a99b1543feb45507f7cc05d459a545b150a7534d214a057e6f84002c692",
    "signature": "0x9fe5a0a6e277285752a14bdd1b7cf0a58dc5454ea482c6f4693fe74c672f06a408ff15b930af3f3a3bd7aaf04d4d223f03a14e24c7fe7f314a6e7e9ed06449551b",
    "signer": "0x37C656432bDD87630C13F60036e9857B5ee36154",
    "userId": "288167767"
  }
}