{
  "manageEntity": {
    "action": "Save",
    "entityId": "628595069",
    "entityType": "Track",
    "nonce": "0xb70b9b21e7271a712e734252fc53a774bc38103014f3c985b85feffd4c91d62e",
    "signature": "0x7842d99ebc04c73196d2c10d08e7719e58439ab05c32d9fe43faf5e5e9e7a0a34869a081d7fa57dc2b2f5ad41081fa00e56e4fabc14479acdaa77b761ec8c5341c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}