{
  "manageEntity": {
    "action": "Save",
    "entityId": "450084",
    "entityType": "Track",
    "nonce": "0x87d0c66c9f6e898be8fbe984a91752b401f220e42dd255d1b2318608364372b3",
    "signature": "0x5a9842bc64cb254a4d545a12287d0919964ea0547a42fdfd21bcad49d8fd930c435869d9c5863c1f0ee818c5e03f6013ca3e35216926c53e32f281d64a5a2b331c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}