{
  "manageEntity": {
    "action": "Save",
    "entityId": "646013459",
    "entityType": "Track",
    "nonce": "0x14510e9f068524b72d5863636bdda133a7411ab83b9ff5e084722ba86926ab7b",
    "signature": "0x712dc2807781201a7fa62f45348251c05e55032a306ee53ce9f2b265e88c1d923842a23711193babd1885d15391be6b2dbe106fa2be7ea3cc874a5f298cc2a4b1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}