{
  "manageEntity": {
    "action": "Save",
    "entityId": "584727030",
    "entityType": "Track",
    "nonce": "0x15e125a54fa9bf9c8703e7ab74bd82f73e8b0eb5a03a3db0dbc39be0d88bda74",
    "signature": "0x4d7f6f029931e500cc8e32191cb4c2322b505dca693456c471c304e3584ee1294ca653e42bf87ae27cbc8d4803031d0a620ee4e9e7442343fb3f4f59d7c062851b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}