{
  "manageEntity": {
    "action": "Save",
    "entityId": "250288661",
    "entityType": "Track",
    "nonce": "0x5450c8247db6c43efc021047ac0bb6587e868720c1e4244f2e07d2be8c3c166e",
    "signature": "0xbd0161e0c7304ec598aa07995accfbe19a3ddefbb803abb9f269f064ddfc75f97b5272fc9833f84f42a98b78d82bf7505d1bd97f68dd1b07e53d6818991e30b41b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}