{
  "manageEntity": {
    "action": "Save",
    "entityId": "507766640",
    "entityType": "Track",
    "nonce": "0x179d79ea4a5730c510d7a7e7ad321bd9dea314f7bc16d4298a3f800997b7c3b9",
    "signature": "0x0a8b3211cfdb4c0d63d8197051e2a6f6ae26f4d5700d38d222f7289463a47e3958907bee8d7639977544fbe3801ca9bd2fa41aec5a333dd0207eca0657f6f09e1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}