{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890880896",
    "entityType": "Track",
    "nonce": "0x3a49789bda65f1968f6206b81cee43d960b7a42d7205d345db3f6d3ab791622a",
    "signature": "0xf4377a5663a72f0c3ee5db3f3852307153d298f9cf1898e82a576976bccc2e8754aa2f173642d19776e840c646f49d09ed2618540c1d54963a117d9af3cef8321b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}