{
  "manageEntity": {
    "action": "Save",
    "entityId": "465748822",
    "entityType": "Track",
    "nonce": "0x9caf696017b6cdfbe076ce406510dd2f46be9116378c0a264234ff09837f5586",
    "signature": "0x9f98c1a03353daa1a995534d39e941665ac30fc1bff6a7f5569dad413f0cc89f429e4ff7544330f091e5cba98bc54ad3f72247f89e8eba47e6caace1d037881e1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}