{
  "manageEntity": {
    "action": "Save",
    "entityId": "1742292605",
    "entityType": "Track",
    "nonce": "0x4f467e30dad5bfb3f070da90bb390ca4f645384cf6f41a890960d271efebc7fd",
    "signature": "0x2bcaa9befb4c786f9101dd34866ea97fd8e4491861692f6762b519852f5566903ef52432eaaefd06575b9179b3a4adcfbaff4723c9ff077c9c8dc6d6946a5c761b",
    "signer": "0x98591a180A20DF036EB2C9D2c24B449E65939Df5",
    "userId": "338604526"
  }
}