{
  "manageEntity": {
    "action": "Save",
    "entityId": "591406180",
    "entityType": "Track",
    "nonce": "0x431c3bcbe40107c947758e497703c7cbb5281b888ea751998b901513694161e0",
    "signature": "0x531190e89b19df1173e72693a25e7d6c02a1fe8f5ed9636f8fdd448e2d2749352a305218fe5d3b32feee412fa862655f4aea670913323277a0eb9c2de77915a01c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}