{
  "manageEntity": {
    "action": "Save",
    "entityId": "1298767621",
    "entityType": "Track",
    "nonce": "0xc41600491b9aacbb8905ad13b1f5614d65cd4e66e094bf017303b17466060d7a",
    "signature": "0x7107a40be4c68d1c670a58b302256d639ffb1a1fbffe1280b68942bc67ebcec749b1c7ec8f4c5310420725c8472d6a6ad8129d50172bd296814bc69cdeae94a31b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}