{
  "manageEntity": {
    "action": "Save",
    "entityId": "1876334154",
    "entityType": "Track",
    "nonce": "0x5d49bdfa29c4242efb4a93d72f8dab006d84f3d7ce11a3ff7dc8fe95f891fc62",
    "signature": "0x78aef5f3e79f79006f04a480b73f7a94700e82c9f536966aabb2c1b17cbc154661e15af38f85bbceb4207e00b47b452fca8a955aa3ddc000577b76cdf1dbb0131b",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}