{
  "manageEntity": {
    "action": "Save",
    "entityId": "1397383619",
    "entityType": "Track",
    "nonce": "0xb9cf2b4d94aa3a59bae4c08289d894f4abc9c62925a31bf17123e36de06bfc3f",
    "signature": "0x215efb7ddf2c33c9d32dacbaeb7ef8131ea259e794e6aa9ee5272bbeea74e5b23cb1550130613a68dd7271af840a7e08d42415f5fcf9c33fb21eac16c5ac8a761b",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}