{
  "manageEntity": {
    "action": "Save",
    "entityId": "265912649",
    "entityType": "Track",
    "nonce": "0x5a75c9a83c958fc20028a155d4da3cbd6ee43c56dc7af24def4b3e6077de78b4",
    "signature": "0xdf1cffb0c6acf2328c43dc377b61581fd55b85d3ec3ccfb027a7cbf57dfe5a003a72338eee99c477142d0b71161cabe58ceed15552c8314a95ac6ded188db6891c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}