{
  "manageEntity": {
    "action": "Save",
    "entityId": "199903355",
    "entityType": "Track",
    "nonce": "0xf722ad761f93d638fd64f314db0134406cbfb744f7016f0500da8fb0d4f142f3",
    "signature": "0xadd2a31ac7cae0b781aef52d64a2d9f7377debfc637b8556aea317d35fc7315e17b51084df91f6e392987838b58aea1c2fb7b54b6980ac5de71d59ffde3e24741c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}