{
  "manageEntity": {
    "action": "Save",
    "entityId": "619462",
    "entityType": "Track",
    "nonce": "0x02ad98ec6b01d24ec2884a205258832ce72c894dbe7edebd554a0ca60f283cb7",
    "signature": "0xc6c9002a7acba02ec4be2b3656e7b560a239ea52ded0c4ac47286592ee41d4f80010cdd7fb9e6b58ea4460c9cf8867807f0c8d412ee9edadb138760f891142091b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}