{
  "manageEntity": {
    "action": "Save",
    "entityId": "503700651",
    "entityType": "Track",
    "nonce": "0xa57cd6c9866a7adf57aec1ac0e8af81b9f15735cb27059f1713eb84e2dd92b0c",
    "signature": "0x53a4c39e2989505bdb47b72cff8e3e3c633c7825283057a32da007e0ca6e93e86032a5029b7585544e869f7ef50fb3f59d861b581f736f68858692d28babaa301b",
    "signer": "0x0fe82f565AaE260D57b8e691c61Fb05fE83B6F81",
    "userId": "614212580"
  }
}