{
  "manageEntity": {
    "action": "Save",
    "entityId": "42950465",
    "entityType": "Track",
    "nonce": "0x49d51ce19a5fbbdac0b6db6e2c5977faf5e9829070b4aa33a5a8049cf5e4cd0d",
    "signature": "0xd029f2fa1e6bca762dd0b0689d75ebf5f8f857a1b92c184c4ee9cb595aad330d0c9601b7086886aef42f4f549c762cf83516dd63199328d4770f2737f851e2031b",
    "signer": "0x849b8180f084363b37768C823c174C9786020A66",
    "userId": "817339612"
  }
}