{
  "manageEntity": {
    "action": "Save",
    "entityId": "627615",
    "entityType": "Track",
    "nonce": "0x66d08ce16bd3fd11f893a07c256457af5a966ba5f1fe6e8019539b5cf97a89b1",
    "signature": "0xef8fcce5070e24c9ddf1986d5d8b841c199e9c5cae366333743d2be39cbdc1fe71be136da221359528e1aaa9826e1dd0223373424aa0254965e73112596746341c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}