{
  "manageEntity": {
    "action": "Save",
    "entityId": "147321",
    "entityType": "Track",
    "nonce": "0x21c0ee8603bac17d85f951424deaf318e7cb5a3225cb8370f94206c9679c89b0",
    "signature": "0xe79b40b3dc67ad626fd8bf319f5e22825a9d97ee4535165bce7ec9c1ce1e4f751307be32625087a11597ba8e27b0a9a30e7c85cb69f7c79bdfbdc108939a48aa1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}