{
  "manageEntity": {
    "action": "Save",
    "entityId": "1882360800",
    "entityType": "Track",
    "nonce": "0x52a2667c74486b0cd9286adacb23844ffbab6a9b37651663ed8f74a861fc5f40",
    "signature": "0xc136e578857f261c858de23e839611e73288d89655f7d0541b8ee69a58c883746b1ac12324de511b410213a7203805872aaa4d153cc6923e802d2597b601a4c61b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}