{
  "manageEntity": {
    "action": "Save",
    "entityId": "508017",
    "entityType": "Track",
    "nonce": "0x66a6286e3b66373ba341c5157f84548e40d3fc05d7116b29e1f068ff336c3397",
    "signature": "0x0b41e0e978df1e82be5dc1beeb5895a135edc905dd633989d850c45d5e6f0340715ec375161adb64f91cee3a48a15d74823f7d42e842d4c6f66f13c5dc5faccc1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}