{
  "manageEntity": {
    "action": "Save",
    "entityId": "902683179",
    "entityType": "Track",
    "nonce": "0xb6ac7b8f6d9e871fb76e04898870ce1a73c7e24ac8b62ee0feefe66d2d222d4e",
    "signature": "0x696243adfb89708ed7612b294da47e7b45eb8916b3a38073486e262b2c5378bb29224ba34a001f1929133803d3379cbd5ea544cc64a5241395e8c3acec33f5511c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}