{
  "manageEntity": {
    "action": "Save",
    "entityId": "474910",
    "entityType": "Track",
    "nonce": "0xe287b336e9a32b28706108d1aaafa049ce0eb5f4cd3b30a01e8ab5ef053aaed6",
    "signature": "0x34a0be1ac4c9f4ef31e75019e0198f526f8a69712da8dd496bd99cfc09e0be195acc8ff6260bcae6b4a1913f33b619570da9671f6835e56ae02d9f0fed0940441b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}