{
  "$schema": "https://json-structure.org/meta/core/v0/#",
  "$id": "https://raw.githubusercontent.com/api-evangelist/amazon-managed-blockchain/refs/heads/main/json-structure/amazon-managed-blockchain-username-string-structure.json",
  "name": "UsernameString",
  "description": "UsernameString schema from Amazon Managed Blockchain API",
  "type": "string",
  "pattern": "^[a-zA-Z][a-zA-Z0-9]*$"
}