{
  "manageEntity": {
    "action": "Save",
    "entityId": "893889913",
    "entityType": "Track",
    "nonce": "0x8f021905d449c1ed6a12057e2086367265c1edf741357ae1e1789713f101988e",
    "signature": "0x7193b899a3db6be640b602608d5995a80f0f7f1bdb6ab6717cb3c6473382967663a1ee67ce918ab5b0509c5f91756390c3b56c10dd774fe2677777b00e22e54c1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}