{
  "manageEntity": {
    "action": "Save",
    "entityId": "1999135900",
    "entityType": "Track",
    "nonce": "0x705ef64d6fc0d1dace8ee12fe4340a6a88ea322c110a5ef16ed1470e73635263",
    "signature": "0x329c239490a0f56e906378f193b23a47d6cbb8b3cf228cf90fb5d0a2b0d8fe5a1175256397e3ae3868024ffb9461dba47694c5386b34ea7149066bd4e40e5ac31c",
    "signer": "0xd648B38B61b65e4F8df57D4EE65560D8DaacFDb2",
    "userId": "277314120"
  }
}