{
  "manageEntity": {
    "action": "Save",
    "entityId": "1951602804",
    "entityType": "Track",
    "nonce": "0x13f3c94fc1edea3a9774c21a5ba4eb500b0d7786e8c41fda5769e92686b85f52",
    "signature": "0x5bb828bd2e3343f7af4ecb61eecb02d97fe17395ac654252cd2b719836974b425cf30aabdb595a0c52c7b7b60f9fe9469f2597da2f3018e85d99d635480de3f21c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}