{
  "manageEntity": {
    "action": "Save",
    "entityId": "273698",
    "entityType": "Track",
    "nonce": "0xd842ad7362b72d5afbf017157f8be078ea987afb9da1441d8f7c3fb70328039d",
    "signature": "0x236580d47cecd0a522645dcf2b87ee24dca26f4e5806ad5c45578f2f7d11fc2f15555b516bb969e3039d598f6efd7624284c92e4bdc11f687a32d7b5f9294a191c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}