{
  "manageEntity": {
    "action": "Save",
    "entityId": "639855980",
    "entityType": "Track",
    "nonce": "0x71454afe644ed1ab5d2c658e99f2d98d41c248c66b7b785d802d0e647fc165b3",
    "signature": "0x3692fd1f7164e12b0bde8ab7f82106c97e92c63741d71a90ef7fb47c84a354be56f81664ce612c2e75e7d5a77f7a7a0261481c13a87a2cc806654d34316eba131c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}