{
  "manageEntity": {
    "action": "Save",
    "entityId": "1513947444",
    "entityType": "Track",
    "nonce": "0x398698fd7c3df795b1fa29e1128053bcb0fdd1420c9512da0fc248ed2b743072",
    "signature": "0x9dc14ffe2f8773bc11c5bce2b192393a8968551be325e97a30baa166abcf4b152e96a9ec4a4bd15a76579a72bd61f24ccfcc00c4b1bf4b8c9510e6a16c6d02bd1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}