{
  "manageEntity": {
    "action": "Save",
    "entityId": "631748",
    "entityType": "Track",
    "nonce": "0x21a34d3d7c53cb9a1dc44918859b9620455eb398185411b12a0b6febae25bf66",
    "signature": "0xfefb1426fd34495d4361da25998d80b74048d52512dde5b943babb1d730b70b27a0e3c2b7490a2409e77d57318ed1dcb6165635abe3f77a7bcd2cdf588ac60001b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}