{
  "manageEntity": {
    "action": "Save",
    "entityId": "505919",
    "entityType": "Track",
    "nonce": "0xffdbb3a0a2a4cecbe3a67301e0ea741b80d255e7287deaef55e0b1d4ceebd852",
    "signature": "0xcd405523b7937c1d623e2865d3bd861ea9d0a6359538e4e5140c5362035e8fec45c9c1063bce61a5ff3f6dff90fa7aa54c1a24542f19f97d5377b854be1123841c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}