{
  "manageEntity": {
    "action": "Save",
    "entityId": "603040",
    "entityType": "Track",
    "nonce": "0x1ee6f486180fe879033638030025644d2c537a2bf34ad55aee03446e0a62f52e",
    "signature": "0x91007d1cd3c5b33237dc0bcb9bd95dffd8840279a4bfc8403d899c0e0db96d5c7ab5934f2b38ee8238db3ac59dad58781dab810637398385a6527e6fc5f5de321c",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}