{
  "manageEntity": {
    "action": "Save",
    "entityId": "250175",
    "entityType": "Track",
    "nonce": "0x03d90b3dec091d1f49055876f678a160602bb87eeec2e5536c4ab83636364a34",
    "signature": "0x038af085c9a9b15cdca384d9cdc709830dc36de4fe96cdd08eb475e21b0b42822128c489b0b217f77d83d8efcca982bd466f28e7e9fb91d0540e1c31e3e2a24f1c",
    "signer": "0x97eAfE883FbF33a8b75f6f37440caFE5CC452d3f",
    "userId": "849776474"
  }
}