{
  "manageEntity": {
    "action": "Save",
    "entityId": "1374810516",
    "entityType": "Track",
    "nonce": "0x4d76d9bcd1e02301b802261324d884f88cc4d340984be37ca9abac3914baa34d",
    "signature": "0x7215ce6678fcfff2c0247c401473fb459ead141111cf06ae3b699df28e34afda0c5054d41039a0dc57f39ba7762997af32a40065a2e7d814b222a5f75c2694ab1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}