{
  "manageEntity": {
    "action": "Save",
    "entityId": "559286",
    "entityType": "Track",
    "nonce": "0xd20f603b64db0d8fabea9ef6090f9ca1af2473d3ae1a28a4e989700deb43c1a1",
    "signature": "0x45128d38e1e8c261a82aa89170089cb88ceab6738284ec5175593c9b5f7af3f135ac25ec5cd615a8d7f7ac894ccb1274d00ba346330995b399e1ce7b56145f351c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}