{
  "manageEntity": {
    "action": "Save",
    "entityId": "1573547152",
    "entityType": "Track",
    "nonce": "0xe1de97bd6ae1c51aeac2e441e4156b925a66f00c06717ebf6881955a4147d2a1",
    "signature": "0xab367796d2a838e426294d1f427e70097266786c96747cb52bf3664343315ced24e6adcbb1defa6d8cf8ce4378edfccd992407d4fd7a803509ab0b60d3a10e8b1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}