{
  "manageEntity": {
    "action": "Save",
    "entityId": "1353273907",
    "entityType": "Track",
    "nonce": "0xe57edf69e4e1f70b167657401c63fe5c955046c9e64e6494a5050ac666a2fa48",
    "signature": "0xbf0e76ea37dc3229ef69cbe6c236de3ca4efd0b463d8673e3fef8d34e7e539f10bf8a89df577ad08a99b08b4ebe61485fba06d9f5c89033f406b48818ca78d0d1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}