{
  "manageEntity": {
    "action": "Save",
    "entityId": "264199",
    "entityType": "Track",
    "nonce": "0x7b23cdb8cf3fefbd346df46f52560eb452e7bc9d1fae664a08aa1eeed340b322",
    "signature": "0xb355bbc86e813a5e08c8664379c27f52290f6f421395664dd9c197a0fd9a129b07152f6663b83ab9e6fef055cb21e714bfab5540ede4dfacc4c1164ffceb73191c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}