{
  "manageEntity": {
    "action": "Save",
    "entityId": "1877568636",
    "entityType": "Track",
    "nonce": "0xdd96c0227c7783b8c111f9d4a0945738671f7937801bad20788672fbcc62f680",
    "signature": "0x3b40f22eea9af0797ade5b2e6f5a3cbef2e2204abf9855cae058156ee1b246f56b09a4733d53bac66f2f17a2ef6d104f9e233d5226cc731695f6c6f777fc91ef1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}