{
  "manageEntity": {
    "action": "Save",
    "entityId": "733540",
    "entityType": "Track",
    "nonce": "0xf66be68cae2f0883df96eadbb1335b9f019f7785da68f2b1f317071605ccb055",
    "signature": "0xf1a09ebcc4340af6b718e561f024066d486d3c14e0c6cfcbc6c374d4268d2f52342035f9df67b568bf2f2d1654058856b4affae0306e9f3a3baf82342267a7631c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}