{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616800140",
    "entityType": "Track",
    "nonce": "0xdd3e33e95ce23b89bba65b1fd61128b4fa23f3d53dcbd6fd811fd3fe0a5a6dbf",
    "signature": "0xd3bea0bf1c21e5b3afd98d042df2cc041cbcef7da74c0da1386c13021aceb2a54ec35427b14cb5ae6b5dd46977d5cc95bd33d0edb997270e31b09975c2e4934c1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}