{
  "manageEntity": {
    "action": "Save",
    "entityId": "209657463",
    "entityType": "Track",
    "nonce": "0x9fff70ef841531d3b69e9e008ed6675bffe2cd7c9fc80af80498c6ad395a7b12",
    "signature": "0xcc44b29abfd3e71036b411fe2c4e3abea04a1c7e89ce2f0d348238291ef6a6b87f0f40d2888cf21b85eddf53c64472b6ef523ff4457239000d302f95848f4c9e1c",
    "signer": "0x0C6D8C2BA2A5C59e3a0Af2b5Dd3995aA0D91221D",
    "userId": "755516"
  }
}