{
  "manageEntity": {
    "action": "Save",
    "entityId": "403489",
    "entityType": "Track",
    "nonce": "0xe665fc55f276cd607bb001fdb92c4ee76cb6d00e059909fb51bf038b9cf52efd",
    "signature": "0xc0b479ff396d376907c3e8c5395690fa9b80c472434cf316994cd290579af5282862f432ec4eb0ff7e766474ccdf5971d98abdb7fd444c479776e2f0a97b5b231b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}