{
  "manageEntity": {
    "action": "Save",
    "entityId": "445318",
    "entityType": "Track",
    "nonce": "0x49ed96049327f69e27c002efdca9f57077084834b3e35ebd0f07ab311ab33148",
    "signature": "0xe7337d9573bf371c0f19800b666174d099d5692b714e1120cb296ff03d7c23a701815f7bde620b0f2f625b4c7ca38aec6b11ced869eba131f52eb958db293eef1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}