{
  "manageEntity": {
    "action": "Save",
    "entityId": "408958817",
    "entityType": "Track",
    "nonce": "0xbe735656ba9ef46f3180b8aa009d687711699aa000ebb3c9ede54c7018c1d0c0",
    "signature": "0xfb9d71fcd0d8d81ae6cfd70ac517228fa96b830646c44cea9faeeb521f3800e949133357949409c708c8b34a54ac260d841b4c596db5eb234d305ab35ee3c1d41b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}