{
  "manageEntity": {
    "action": "Save",
    "entityId": "608168216",
    "entityType": "Track",
    "nonce": "0x56d2c050ad285524a6bba228070d7d68853730995586c51c235c3ca74aa0c4fc",
    "signature": "0x3ffbccb81a4402248f6d7d0577fb2673a2a9ef622180e7dd2fe48fbdecb8a5e209344389261b5cce817bb58c6c03d277e1565ac58c9d30cb7e830f0b15bcbb711c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}