{
  "manageEntity": {
    "action": "Save",
    "entityId": "1843338985",
    "entityType": "Track",
    "nonce": "0xc53228401639dc3bcb9ae7f4111714da738be7a4c5831ac8e26960974fa20782",
    "signature": "0xb0d929fda3dfd13af671b2d5cf5e2f88581f4cc094bf6e6a2c2eb2d5a8c454c83405e36ca1ca97c669f46b5ad62c5c83301931552654bea2cfe2a66e60f43d0c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}