🎵 ₿ from hash to harmony: an orchestrated Bitcoin indexing suite ₿ 🎵

Maestro Symphony

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Overview

Maestro Symphony is a fast, mempool-aware, and extensible Bitcoin indexer and API server. It provides a framework for indexing UTXOs, metaprotocols, and any other onchain activity.

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Core Features

Supported Networks

• mainnet
• testnet4
• regtest

Indexers

• Runes
• Transaction count by address
• UTXOs by address

Endpoints: OpenAPI

Mempool Awareness: Query any endpoint with ?mempool=true to include pending transactions.

Rollback Handling: Always maintains an index of the longest chain.

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Prerequisites

• Bitcoin Core (22+) with RPC and P2P access
• Rust (stable)

Optional Tools

• Docker
• mise

Deployment Requirements

Testnet4

• Disk: 4 GB
• CPU: 2 cores
• RAM: 4 GB
• Sync time: ~30 minutes

Mainnet

• Disk: 100 GB
• CPU: 4 cores
• RAM: 12 GB
• Sync time: ~4 days

NOTE: Deployment requirements are subject to change with new indexers and API endpoints.

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Configuration

Below is a table describing the main configuration options for maestro-symphony. See the example configuration for context.

Section	Key/Field	Description	Example Value
root	db_path	Path to the database directory	"tmp/symphony"
[sync.node]	p2p_address	Host/IP and port for P2P connection to Bitcoin node	"localhost:8333"
	rpc_address	URL of your Bitcoin node's RPC endpoint	"http://localhost:8332"
	rpc_user	RPC username for your Bitcoin node	"bitcoin"
	rpc_pass	RPC password for your Bitcoin node	"password"
[sync]	network	Bitcoin network to connect to (mainnet, testnet4)	"mainnet"
	max_rollback	Number of rollbacked blocks from tip that can be handled	32
	mempool	Enable mempool awareness	true
	utxo_cache_size	Memory in GB to allocate to UTxO cache (default 40% RAM)	1.0
[sync.indexers]	transaction_indexers	List of enabled indexers and their options	See example below
[server]	address	Address and port for API server to listen on	"0.0.0.0:8080"
[storage]	rocksdb_memory_budget	Bound RocksDB memory usage in GB (default 25% RAM + ~2% DB)	3.0

See examples to quickly get started.

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Deployment

Quick Start with Snapshots

See instructions here.

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Running Locally

Optionally, use mise to easily set up your environment:

mise install

Build

make build

Sync & Serve

make run [CONFIG=examples/testnet.toml]

Sync Only

make sync [CONFIG=examples/testnet.toml]

Serve Only

make serve [CONFIG=examples/testnet.toml]

Generate OpenAPI

make openapi

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Running with Docker

Start

make compose-up

Stop

make compose-down

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Endpoint Examples

Rune UTXOs by Address

curl -X GET "http://localhost:8080/addresses/tb1pn9dzakm6egrv90c9gsgs63axvmn6ydwemrpuwljnmz9qdk38ueqsqae936/runes/utxos" | jq .

{
    "data": [
        {
            "tx_hash": "63937d48e35d15a7c5530469210c202104cc94a945cc848554f336b3f4f24121",
            "output_index": 1,
            "height": 30562,
            "satoshis": "10000",
            "runes": [
                {
                    "id": "30562:50",
                    "amount": "100000000"
                }
            ]
        }
    ],
    "indexer_info": {
        "chain_tip": {
            "block_hash": "000000002ec229e75c52e8e9adf95149fdde167b59c3271abb6bf541ef85249b",
            "block_height": 87777
        },
        "mempool_timestamp": null,
        "estimated_blocks": []
    }
}

Rune Info (Batch)

curl -X POST "http://localhost:8080/runes/info" \
  -H "Content-Type: application/json" \
  -d '["30562:50", "ABCDEF"]' | jq .

{
    "data": {
        "30562:50": {
            "id": "30562:50",
            "name": "BESTINSLOTXYZ",
            "spaced_name": "BESTINSLOT•XYZ",
            "symbol": "ʃ",
            "divisibility": 8,
            "etching_tx": "63937d48e35d15a7c5530469210c202104cc94a945cc848554f336b3f4f24121",
            "etching_height": 30562,
            "terms": {
                "amount": "100000000",
                "cap": "3402823669209384634633746074316",
                "start_height": null,
                "end_height": null
            },
            "premine": "100000000"
        },
        "ABCDEF": null
    },
    "indexer_info": {
        "chain_tip": {
            "block_hash": "00000000000000108a4cd9755381003a01bea7998ca2d770fe09b576753ac7ef",
            "block_height": 31633
        },
        "mempool_timestamp": null,
        "estimated_blocks": []
    }
}

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Mempool-Aware Rune UTXOs by Address

curl -X GET "http://localhost:8080/addresses/tb1pn9dzakm6egrv90c9gsgs63axvmn6ydwemrpuwljnmz9qdk38ueqsqae936/runes/utxos?mempool=true" | jq .

{
    "data": [
        {
            "tx_hash": "63937d48e35d15a7c5530469210c202104cc94a945cc848554f336b3f4f24121",
            "output_index": 1,
            "height": 30562,
            "satoshis": "10000",
            "runes": [
                {
                    "id": "30562:50",
                    "amount": "100000000"
                }
            ]
        }
    ],
    "indexer_info": {
        "chain_tip": {
            "block_hash": "000000002ec229e75c52e8e9adf95149fdde167b59c3271abb6bf541ef85249b",
            "block_height": 87777
        },
        "mempool_timestamp": "2025-06-23 22:04:31",
        "estimated_blocks": [
            {
                "block_height": 87778
            }
        ]
    }
}

Rune Balance Changes in a Transaction

curl -X GET "http://localhost:8080/addresses/<ADDRESS>/runes/tx/<TXID>" | jq .

{
    "data": [
        {
            "rune_id": "30562:50",
            "amount": "100000000",
            "output": 1,
            "block_height": 30562
        }
    ],
    "indexer_info": {
        "chain_tip": {
            "block_hash": "0000000000000035ec326a15b2f81822962f786028f33205b74b47a9b7cf3caf",
            "block_height": 38980
        },
        "mempool_timestamp": null,
        "estimated_blocks": []
    }
}

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Security

Maestro Symphony has undergone professional security audits to ensure the safety and reliability of the codebase.

Audit Reports

• Thesis Defense Security Audit (September 2025) - Independent security assessment of the core indexing and API components.

For reporting security vulnerabilities, please see our Security Policy.

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Contributing

Pull requests and issues are welcome! See the Kanban board for project status and tasks.

Feature Checklist

• Base Indexer
  • Addresses
    • Runes by address
    • Runes by address and rune ID
    • Runes by address and transaction ID
    • Rune UTXOs by address
    • Rune UTXOs by address and rune ID
    • UTXOs by address
    • Satoshi balance by address
    • BRC20 by address
    • Inscriptions by address
    • Transactions by address
  • Runes
    • Rune info by rune ID
    • Rune balance by rune ID and UTXO
    • List runes
    • Holders by rune
    • UTXOs by rune
• Wallet activity
  • Addresses
    • Satoshi activity by address
    • Metaprotocol activity by address
    • Historical satoshi balance by address
    • Inscription activity by address
    • Address statistics
• Alkanes
• Webhook Notifications

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License

This project is licensed under the Apache 2.0 License.