Crypto Wallet Integration

Slotty Labs supports deposits and withdrawals across 9 blockchain networks with native tokens and major stablecoins.

Supported Chains

Chain	Family	Native Token	Decimals
Ethereum	EVM	ETH	18
BSC	EVM	BNB	18
Polygon	EVM	MATIC	18
Arbitrum	EVM	ETH	18
Base	EVM	ETH	18
Avalanche	EVM	AVAX	18
Solana	SVM	SOL	9
Bitcoin	UTXO	BTC	8
Tron	TVM	TRX	6

Supported Tokens

Token	Chain	Contract Address	Decimals
USDT	Ethereum	0xdAC17F958D2ee523a2206206994597C13D831ec7	6
USDC	Ethereum	0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48	6
USDT	BSC	0x55d398326f99059fF775485246999027B3197955	18
USDC	BSC	0x8AC76a51cc950d9822D68b83fE1Ad97B32Cd580d	18
USDT	Polygon	0xc2132D05D31c914a87C6611C10748AEb04B58e8F	6
USDC	Polygon	0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359	6
USDT	Arbitrum	0xFd086bC7CD5C481DCC9C85ebE478A1C0b69FCbb9	6
USDC	Arbitrum	0xaf88d065e77c8cC2239327C5EDb3A432268e5831	6
USDT	Base	0xfde4C96c8593536E31F229EA8f37b2ADa2699bb2	6
USDC	Base	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913	6
USDT	Avalanche	0x9702230A8Ea53601f5cD2dc00fDBc13d4dF4A8c7	6
USDC	Avalanche	0xB97EF9Ef8734C71904D8002F8b6Bc66Dd9c48a6E	6
USDT	Solana	Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB	6
USDC	Solana	EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v	6
USDT	Tron	TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t	6
USDC	Tron	TEkxiTehnzSmSe2XqrBj4w32RUN966rdz8	6

EVM Chain Configurations

Chain	Chain ID	Block Time	Confirmations	EIP-1559
Ethereum	1	~12s	12	✅
BSC	56	~3s	15	❌
Polygon	137	~2s	64	✅
Arbitrum	42161	~0.25s	1	✅
Base	8453	~2s	1	✅
Avalanche	43114	~2s	1	✅

Bitcoin Configuration

Setting	Value
Address Type	native_segwit (bc1q...)
Standard Confirmations	3
High-Value Confirmations	6 (≥ 0.1 BTC)
RBF	Enabled
Fee Estimation	Next-block target

Solana Configuration

Setting	Value
Commitment	finalized
Priority Fee	Dynamic (based on recent slots)
ATA Creation	Auto-created for token deposits
Transaction Version	v0 (versioned transactions)

Architecture Overview

The crypto wallet system consists of these components:

• Deposit Scanners — Monitor each chain for incoming transactions to player deposit addresses
• Withdrawal Pipeline — Queue-based withdrawal processing with pre-flight checks
• Sweep Engine — Periodically sweeps deposits from player addresses to hot wallet
• Cold Wallet Management — Automated hot-to-cold transfers based on threshold rules
• Nonce Management — Sequential nonce tracking for EVM chains to prevent stuck transactions
• Gas Estimation — Real-time gas price estimation with configurable multipliers
• Reconciliation — Hourly balance reconciliation between on-chain and database states
• HD Key Derivation — BIP-44 / BIP-84 compliant key derivation for address generation
• HSM Support — Hardware security module integration for signing high-value transactions

Deposit Flow

Player requests   →  Generate unique    →  Deposit scanner   →  Confirm after
deposit address      deposit address       detects incoming      N blocks
                     (HD derived)          transaction

     →  Credit player    →  Fire webhook:                →  Sweep to
        balance              wallet.deposit_confirmed       hot wallet

1. Generate Address — Each player gets a unique deposit address per chain, derived via HD key derivation
2. Scan for Deposits — Chain-specific scanners poll for incoming transactions every block
3. Confirm — Wait for required confirmations (chain-specific, see tables above)
4. Credit Balance — Player balance is credited in the internal ledger
5. Webhook — wallet.deposit_confirmed event is sent to your webhook endpoint
6. Sweep — Deposits are periodically swept from player addresses to the platform hot wallet

Withdrawal Flow

Player requests  →  Pre-flight    →  Queue        →  HSM sign    →  Broadcast
withdrawal          checks           transaction      transaction    to chain

     →  Wait for          →  Fire webhook:
        confirmations        wallet.withdrawal_completed

1. Request — Player or operator initiates a withdrawal via API
2. Pre-flight Checks — Verify sufficient balance, withdrawal limits, AML rules, cooling periods
3. Queue — Transaction is queued for processing (batched for gas efficiency on EVM chains)
4. HSM Sign — Transaction is signed using the HSM (or KMS in cloud environments)
5. Broadcast — Signed transaction is broadcast to the blockchain network
6. Confirm — Wait for required confirmations
7. Webhook — wallet.withdrawal_completed (or wallet.withdrawal_failed) event is sent

WARNING

Withdrawal addresses must be whitelisted by the player before use. First-time withdrawals to a new address have a 24-hour cooling period by default.