{
  "manageEntity": {
    "action": "Save",
    "entityId": "544577",
    "entityType": "Track",
    "nonce": "0xcf8066f5b2262d4145af28fbab03a20a4e8b1f054e4eafc5f9edf9409224cdb0",
    "signature": "0x05b6f91c621d1506dd7c37d5105d9ebbc722ec4a320a9876aa736714f75d9c2b388d80b768cd2afa067755df1fc4431429fd0a14bad7d456c7e1a4a7565c71a71c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}