Contract Calls for Allow Lists

For EVM-based tokenization workflows, allowlists are commonly managed in smart contracts. Blockdaemon supports real-time updates to those allowlists using governed Contract Call transactions, making it possible to add or update investor wallet permissions as users pass KYC or move to new addresses.

This is particularly useful for compliance tokens and other restricted-transfer models.

How it works

A typical allowlist update flow includes:

1. A user passes KYC or onboarding checks
2. Your system prepares a contract call to update the token registry or compliance contract
3. The transaction is routed through policy and approval controls
4. The allowlist is updated on-chain
5. Future transfers can be checked against the updated state

Batch allowlist updates can also be supported via multi-call transactions.

Example Solidity interface

interface IAllowlistRegistry {
    function addToAllowlist(address investor) external;
    function removeFromAllowlist(address investor) external;
    function setAllowlistStatus(address investor, bool allowed) external;
}

Example contract call payload

{
  "chain": "ethereum-mainnet",
  "fromVaultId": "vault_compliance_ops",
  "contractAddress": "0xfeedfeedfeedfeedfeedfeedfeedfeedfeedfeed",
  "function": "setAllowlistStatus",
  "args": {
    "investor": "0x1111111111111111111111111111111111111111",
    "allowed": true
  },
  "policyProfile": "allowlist-admin"
}

Example multi-call pattern

const calls = [
  encode("setAllowlistStatus(address,bool)", [
    "0x1111111111111111111111111111111111111111",
    true
  ]),
  encode("setAllowlistStatus(address,bool)", [
    "0x2222222222222222222222222222222222222222",
    true
  ])
];

Policy controls

Policy can be applied at several levels:

• per account
• per contract
• per function

For ABI-decoded EVM calldata, Blockdaemon can also inspect selected value-related parameters. For more bespoke logic, an Automated Approver callback can inspect calldata and apply custom approval rules before signing.

Why it matters

Allowlist management is often operational, frequent, and compliance-sensitive. Treating it as a governed contract call helps you:

• update investor permissions in real time
• reduce manual signing risk
• apply function-specific approval groups
• enforce pre-sign compliance checks

When to use it

Use this approach when you need to:

• add newly approved investors
• revoke or suspend addresses
• batch-update wallet permissions
• enforce pre-transfer compliance checks against allowlist state

Notes

The exact allowlist mechanism is protocol-dependent. On EVM chains, it is typically contract-based. The presentation also notes that policy callbacks can verify whether sender and receiver addresses are allowed before a transfer is approved.