{
  "manageEntity": {
    "action": "Save",
    "entityId": "439389728",
    "entityType": "Track",
    "nonce": "0x41c60ea5e337045005ec79bc30df5c7b6552ed0c198decb874b1e4af0f751a48",
    "signature": "0x20573fffd4f90162130141b87ad5ae6e7f62fc141440c72e29e39129a6726ed338f7435e0c2142f3b167491ed00d5a12d71384945b3a734f95b26fc556e2a1bf1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}