{
  "manageEntity": {
    "action": "Save",
    "entityId": "1857022974",
    "entityType": "Track",
    "nonce": "0xa5d110e99503d06eeb0e853abe87137d52cf6407f59f8b65eb9ca4061600abb7",
    "signature": "0xc7d210766eaa760705642ad9e70293434666a83c48c5698745a8d60b93c8898c4ac973e5aa74f21e9a2c3ecc1246dd7f769d0b7a17a2b69b833c0b18a3314a0c1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}