{
  "manageEntity": {
    "action": "Save",
    "entityId": "1553616399",
    "entityType": "Track",
    "nonce": "1785398852187210949",
    "signature": "0xbaf544637a44b6424ff08c1aaec3ddf1ef82ddf3715db564fe8dbcf6f8498c4a7ee9f945dc3fffff0f07da4f7b0ab9304347c7e987c16e22f84d5ddf4e45fcf81b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}