{
  "manageEntity": {
    "action": "Save",
    "entityId": "1402549437",
    "entityType": "Track",
    "nonce": "0x721bf3849dd61e8ed5182f6823a3b9a0d3f5c239b29d75f23097b7aa5f16b6ef",
    "signature": "0x8379d3917e2d8d0d33b7e27d90f493b811632f5e46ce62f38d352a37c2114ab81505d18eba088eb59e5705925ba72f2473ba1afaae1d5be3c738829a80752ddc1b",
    "signer": "0x4F8e40E75E675f5be20520c4cEA0CbD7bBb999B1",
    "userId": "991796067"
  }
}