{
  "manageEntity": {
    "action": "Save",
    "entityId": "1855423776",
    "entityType": "Track",
    "nonce": "0x4da54f88dfa62f4ea7bea97945fe943a232a2c34823c1b5daa5fa60fb15171a4",
    "signature": "0x809714d8bb2ad4ecb38f4258b5328f1cba8c121182d594986645db1885ad7f2915c65bb1dfe15704b169a7e15004608ac6f8bc60334b53ace3b9415b5deb08f41c",
    "signer": "0x5b1BC6b15bFD49D3991AD6E84621e7f0FBF2a77e",
    "userId": "548409021"
  }
}