{
  "manageEntity": {
    "action": "Save",
    "entityId": "720933587",
    "entityType": "Track",
    "nonce": "1790358462285318226",
    "signature": "0xefbcc58552940ac34b7a2944e4fe347b6583a542092825ae8d5b09025445bce574d591555d4324c1373d34f24a8a2bd9f78ab884f75016bc58308f76ada4e5d31c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}