{
  "manageEntity": {
    "action": "Save",
    "entityId": "521931779",
    "entityType": "Track",
    "nonce": "0x9a04b333fd55c7e54a4e18c9f9f27613cc696a7600e9ca1b6ffd59bd67bd0398",
    "signature": "0x7b9ca1943ae81445934044bee9411f6303d359a51f0c0f4699d23eba0fae0a2267bb4addd81bbf5042eeadb6bb95846bc46bb2ca9e08634495ff8cb14ec915d11c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}