{
  "manageEntity": {
    "action": "Save",
    "entityId": "80466921",
    "entityType": "Track",
    "nonce": "0x449a5a10ae09f8213c362ae4a333f76ab3f8ed640b12078e54240d39de77a000",
    "signature": "0x9158314b555cd576b45509aa60804dca61866e8bd73e1b93d40d59bffdcedb3517689a3c44270789948d07bab42bdc19cc3381475ca54f5541b76c45563a91e01b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}