{
  "manageEntity": {
    "action": "Save",
    "entityId": "774008",
    "entityType": "Track",
    "nonce": "0x95ab74fc59ad6e1b2b54b8e6b6b3a9780324f917f74c56a4f0bb75bc035108b6",
    "signature": "0xb3ae6e84fd155e4245fb68b480d3c853f1ee59c70e0f7be6d4603a822bdf56c5503612ec5e818a4f12c62fcd8335e5f9f83a5cf93c8bb90e95c9018ecbf1a19a1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}