{
  "manageEntity": {
    "action": "Save",
    "entityId": "972587859",
    "entityType": "Track",
    "nonce": "0x46d1d9d6e5eebb5f650163a19ea89f8bb96a743352a37a622909cfcf9c185be4",
    "signature": "0xf8c1e4c03fbb74fa9836125b54cff234f6715ce98494430edaab672569b15d040454504c3a3708d6c9263393e03645e487a73c3119814240a1114969ddbbf43b1c",
    "signer": "0x722b43224Dbc7d6931b3C690696EF03933374bff",
    "userId": "772126389"
  }
}