Release notes

• Added hive.keychain.requestSignIn() for account ownership checks through Hive Keychain.
• Added typed KeychainSignInInput and KeychainSignInResultexports from the package entry point.
• Added a sign-in tab to the Keychain playground.
• Added hive.keychainIssuer.token.create() and hive.issuer.token.create() for the Hive Engine tokens.create action.
• Both run a preflight first: the account must hold at least the sidechain creation fee in BEE, and the symbol must not already exist. Failures throw INSUFFICIENT_BEE or TOKEN_ALREADY_EXISTS before anything is signed.
• Added checkCreate() and the exported TokenCreationChecker for reading the fee, the BEE balance and symbol availability without creating anything.
• Added buildCreate() offline payload previews and a create panel in the token playground.
• Added hive.keychainIssuer.nft.create() and hive.issuer.nft.create() for the Hive Engine nft.create action, following the same flow as token creation. Only name and symbol are required; orgName, productName, maxSupply, website and the authorized issuing account / contract lists are optional.
• NFT creation runs the same preflight: 100 BEE by default (read from nft.params) and the symbol must be free, otherwise INSUFFICIENT_BEE or NFT_ALREADY_EXISTS throws before signing. Pass skipChecks: true to opt out.
• Added NftCreationChecker, NFT checkCreate() / buildCreate() on both issuers, and an NFT creation panel in the NFT playground.

• Standardized Custom JSON payloads: { action, metadata }
• Raw Custom JSON for protocols with their own payload shape
• Hive Keychain signing in the browser, no key handling in the SDK
• Backend issuer for Hive Engine token issue, transfer and burn
• NFT issue, issue multiple, transfer and burn
• KeychainIssuer emitting byte-identical contract actions from the frontend
• Transaction reader with normalized, classified operations
• One block engine feeding block, Custom JSON and payment watchers
• Native HIVE/HBD and Layer 2 payment parsing, triggers and validation
• Configuration system with account aliases and environment resolution
• Stable error codes on every failure path

v1.0.0 established the public API contract: everything exported from hivexph-sdk is covered by semantic versioning. Breaking changes require a major version; additive changes ship as minor releases.