{
  "manageEntity": {
    "action": "Save",
    "entityId": "1708949468",
    "entityType": "Track",
    "nonce": "0x64900e065fe1dec215a933e4e31cea4f782d40f916898ab01d9a4086f5ae1648",
    "signature": "0xa52dded0135694693c494075ece99cd7cde2a0fdf0892c2afd5697f0981a49f059c75548c8b687578acba7946d97875c006e822079a86749d6e5c094950695f01b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}