{
  "manageEntity": {
    "action": "Save",
    "entityId": "903407062",
    "entityType": "Track",
    "nonce": "0x6bcd4a4d8f52eeb8e1125ffb4fa9da1e709e4c1ebae8c6bc98e2ae366417b3b9",
    "signature": "0x2406ea4b1ab6b97c83392e136c2f7d66e5dc92f178b0638297ba9fb402fe13e25dc13144129e810461f3d4390b1a564700ab4b7498eff535887f52ef806cf3dd1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}