{
  "manageEntity": {
    "action": "Save",
    "entityId": "1389959775",
    "entityType": "Track",
    "nonce": "0xe1f406331afed8c9d573f3e3498b1ad53e5a1fa1195c2ae314a72a9d120c49ab",
    "signature": "0xc44ba9093477864edb381a8915258c2c8738bf57da99706ffc8f2bc9a891319b1e2c57d3c2ceda9b6ad295c61ec1a798ebed300eb1b01bdaa2397d7dfa6f795c1b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}