{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890837960",
    "entityType": "Track",
    "nonce": "0x7ab14a959c0aa424d7a4da547941b44f6cf72f2b0a4a4254e27d62d936c15138",
    "signature": "0x2650d854860f7795b3464755ae62f065ebf9c4f65a0c42c9919c4722f5a717c26896e7be1dad415fda446404703c28b11165e44f28e1748f6941c7e1e626876e1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}