{
  "manageEntity": {
    "action": "Save",
    "entityId": "155231119",
    "entityType": "Track",
    "nonce": "0x74ee33012aafb15b7392cc17a0dac60009d4e95b5f51976e3184d8cf802c7d94",
    "signature": "0x563897969123f6ded0a95e8fb5c1c58c397da8d921fe8ccdedc545962221adf6433361f39bd0600d0e6b9a5eea63056210855ceda4102c61b22d01394e52a1ec1b",
    "signer": "0x8E12224e4dDc1BdfeC3d5Bf01DB7e4Ec17403ABa",
    "userId": "627040654"
  }
}