{
  "manageEntity": {
    "action": "Save",
    "entityId": "425758914",
    "entityType": "Track",
    "nonce": "0x75b4836b3b2c768a2adfb2eca4458c4a8abb31d33c683ee75c5886a98908ecfe",
    "signature": "0x30f050708026d5417a4aaca42a5a10fc8c6f4a3f4d7c53515ee86fbc8d9ab6f87692c92eaae40a1b659baf22b234f8c0be8001616644e63e8bdfd0274e1d5dd01c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}