{
  "manageEntity": {
    "action": "Save",
    "entityId": "2100005719",
    "entityType": "Track",
    "nonce": "0x4996e900dde76953ccca18d5b48cc3685d6939038bf4931b64cb0d3bbd0069a4",
    "signature": "0x3afc436813f7d15bbcd7767ed2fe508befee798abaf3e5b8f948fb18354b75ca0aace7fd55c20eddb6ad38eb5b61546b67014ba4f12c017a07750ac6277303c41c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}