{
  "manageEntity": {
    "action": "Save",
    "entityId": "597888313",
    "entityType": "Track",
    "nonce": "0x78d765e9754fe90dd0f048acb7e79fd12b6da0529c7f455a60c00d2bb8c9847e",
    "signature": "0x1c18a5fc5a02b993d268a8eec7da6d2685e34a10b30ca49411626e05eb34dc287f3b9e430e743f804c28207a8ee172bd2b44e805352a5502141678395726dd8c1c",
    "signer": "0x669C207e15A757a751fd8f623DFf054C6D3D0b05",
    "userId": "121458"
  }
}