{
  "manageEntity": {
    "action": "Save",
    "entityId": "521279305",
    "entityType": "Track",
    "nonce": "0x51ea1c091a025c222c7ac1bfa51a702bc810160ae17cace7f95f35ca03321323",
    "signature": "0xc101cb018035f3b70fb7746c0ab4a1d70f0acdba473c07a180b6e2773d6dc8e404b71be4766c8c782817034a996253ff7a14516fc787580f7a62d2221b0c39ff1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}