{
  "manageEntity": {
    "action": "Save",
    "entityId": "747838888",
    "entityType": "Track",
    "nonce": "0x29a5c761aff9b170a9035cfcef58b82b0068180a03955ff9b6a207fe4c9c4ac4",
    "signature": "0xe71db64afb9fd2066a28a79b5a8c8d6cb6368843efdacf2db7f16c78e78ca3ef55182e865ae993f46a281ebbce039ce3d1a5f22fce8f643cde59201a59c52f711b",
    "signer": "0x65A498876e76FaEED5676cb4d0B469cD5A7F44Df",
    "userId": "61841583"
  }
}