{
  "manageEntity": {
    "action": "Save",
    "entityId": "1473202547",
    "entityType": "Track",
    "nonce": "0x606b1b7fe1befcf3b7fda51c01f6864235be5f539bd457368c9912929eaf67c6",
    "signature": "0x18734ca79a687d6b061f36c746a4b38794f742d54d2e11e442902e5a64b0da90543b2ef6f69746eb8c8de2a7d4143c6fd68c60d9ad853fa55b3ecb58b8612c381c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}