{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618518478",
    "entityType": "Track",
    "nonce": "0x5ec1bea27aa69b68a44d01d512b8774e9fd8621b0b473be199688b4caa2879e0",
    "signature": "0x3f289d0e9b3a9462f6a5c86cb9e7701faa30703cb65fad3784befe32f14daabd443127baf8670885882b04854b1055107a4b83e000adc88c62a21b74833732281c",
    "signer": "0xA66d5981794A5e084FBD9adBFF28F465924fb9a9",
    "userId": "980224167"
  }
}