{
  "manageEntity": {
    "action": "Save",
    "entityId": "608761457",
    "entityType": "Track",
    "nonce": "0xc5e66b9f035492388a0c2cfad5268a8d07f1ca1694de4dc1f48bd7eef240e913",
    "signature": "0x388125366579322db0f515c9d34c667239f9faff5a44e92068f1912f84697b1548a3c8947aab916ee0b6713b05b00b2c355ce8767a189574e95824969d08381b1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}