{
  "manageEntity": {
    "action": "Save",
    "entityId": "1012221",
    "entityType": "Track",
    "nonce": "0xdc51a4ba4298759515d4e3d7559d455a35c795285b1ceb471d7e336ccd8eac05",
    "signature": "0xc037f069c6ab8c4b7734f7bd20015ec40a3a650f702f86a17a3ce2a44c8d8b841c2d020e3715645f6f374bfe96735581732e578ace8bf5d0b919546a6f6d2bef1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}