{
  "manageEntity": {
    "action": "Save",
    "entityId": "964641",
    "entityType": "Track",
    "nonce": "0x99a612c05ec92de60d407d935ac9a10532ff15eb4a14286447e2ea5a73a5753e",
    "signature": "0x35e14bf5845ee28fb9df0a7b0cf3f10c35d3b50bef126a6d7f511222aa0e08504110ba565f62b12ca48d68589730e53234ec9db7c91c0b4d15a06be31f81fea01c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}