{
  "manageEntity": {
    "action": "Save",
    "entityId": "256420",
    "entityType": "Track",
    "nonce": "0x2b97d455eb4cc2d258ab8aa8b53584834c0a0bd7d93231ebf50b737ca78a39c2",
    "signature": "0x2e0c5b3131dc1c7a3935131276be8927447efa26af88995fb05346d44a9893634b0a7aafb9d2538957e26f55f422e5099d01d1986192dd6e9422d6c021409fe11b",
    "signer": "0x06Ad5789cE045C5B0AeB97849051a7385CA95B4a",
    "userId": "270209897"
  }
}