toggle to allow raw display of miner tag as per WOC

[freemans13]

Summary

Implements a toggle to allow raw (unsanitized) miner tag display, matching WhatsOnChain's behavior.

Fixes https://github.com/bitcoin-sv/teranode/issues/1298

Problem

There was a UTF-8/decoding issue with miner tags. For mainnet block 514587:

• Teranode block explorer showed: A% Zj?d?;?
• WhatsOnChain showed: �^G^GA% Zj�d�;��

TAAL wants to run comparisons and would prefer Teranode to use the same decoding as WhatsOnChain.

Solution

Added a new setting blockchain_raw_miner_tag (default: false) that controls whether miner tags are returned raw or sanitized.

When blockchain_raw_miner_tag=false (default)

Current behavior is preserved:

• Non-printable UTF-8 characters are filtered out
• Whitespace and quotes are trimmed
• Text before the first / is removed
• Text is truncated after the 2nd slash

When blockchain_raw_miner_tag=true

Raw coinbase arbitrary text is returned without any processing, preserving binary data.

Changes

New Setting

• blockchain_raw_miner_tag in BlockChainSettings - controls miner tag sanitization

New Function

• ExtractCoinbaseMinerRaw(coinbaseTx *bt.Tx, raw bool) - extracts miner with optional raw mode
• Original ExtractCoinbaseMiner() preserved for backward compatibility (calls new function with raw=false)

Updated Components

• SQL Store (stores/blockchain/sql/): All miner extraction points now use the setting
  • block_helpers.go
  • GetBlockHeader.go
  • GetBlockHeaders.go
  • GetBestBlockHeader.go
  • GetLatestHeaderFromBlockLocator.go
• Centrifuge (services/asset/centrifuge_impl/centrifuge.go): WebSocket block notifications use the setting

Tests

• Added TestExtractCoinbaseMinerRaw - verifies both raw and sanitized modes
• Added TestExtractCoinbaseMinerRawPreservesAllBytes - verifies raw mode preserves all bytes including binary data

Usage

To enable raw miner tags (to match WhatsOnChain behavior):

blockchain_raw_miner_tag=true

Testing

All existing tests pass, new tests added for raw mode extraction.

[github-actions]

🤖 Claude Code Review

Status: Complete

No issues found. The implementation is clean and well-tested:

• Adds optional raw miner tag mode with backward-compatible API design
• Setting properly documented with detailed longdesc
• Comprehensive test coverage including binary data edge cases
• All call sites consistently updated across the codebase
• Default behavior preserved (sanitized output)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud