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A permissioned token needs a testable answer to a simple question: why did this movement of tokens succeed? A successful wallet transfer proves little if an agent operation follows different rules, a registry change removes an eligibility requirement or a frontend mistakes a compliance check for complete transaction validation.
This walkthrough implements a recipient-country rule against the actual ERC-3643 contract suite and exercises it with 19 passing tests. It also records a deliberately broken version of the module, the failing regression and the correction. The test fixture uses real token, registry and compliance contracts.
Identity signatures are replaced with explicit test doubles, so the result establishes transfer-control behavior within that boundary.
The distinction between documentation and executable behavior matters here. The ERC-3643 specification describes minting as bypassing compliance rules. The pinned implementation used below calls canTransfer during minting. A release review must resolve that difference for its selected contracts before anyone signs an issuance transaction. Start with a policy-to-operation map
Write the intended rule before choosing a module. In this example, an ordinary transfer requires an eligible recipient whose registered country appears in an allowlist. Wallet freezes, available balance and the token's pause state remain separate token-level checks. Country values represent registry records maintained by authorized operators; they do not reveal a wallet's physical location.
The implementation question in blockchain engineering work at Pharos Production is how a requirement becomes an observable contract behavior. For this walkthrough, the useful deliverable is a table connecting each rule to a transaction and an assertion. A statement that the token supports compliance cannot tell an integration engineer which call should revert.
Decide separately what should happen when an investor's country changes while they already own tokens. This module restricts recipients. It does not automatically confiscate an existing holding, prevent every outbound movement or calculate ownership concentration. Those are different policy decisions and require their own enforcement points and tests. Pin the contracts before interpreting the standard
The code below targets ERC-3643/ERC-3643 at commit 2f0704dee9658ad9cd5b6ed82e7427da74c28345. Its package identifies version 4.1.3. The compiler is Solidity 0.8.17, with OpenZeppelin contracts and upgradeable contracts pinned to 4.8.3 and the ONCHAINID Solidity package pinned to 2.0.0. This is a reproducible source selection, not a recommendation to deploy an unreviewed repository head.
Read the selected entry points directly. In this version, transfer and transferFrom combine token checks with recipient verification and modular compliance. Do not describe that as universal verification of both participants. If your policy requires renewed sender eligibility on every ordinary movement, add and test that requirement explicitly rather than assuming the recipient check covers it.
The standard's transfer description groups minting with forced transfers as paths that bypass compliance. However, the pinned Token implementation checks canTransfer(address(0), recipient, amount) inside mint. Our mint-denial test captures this behavior. Preserve that test when upgrading the dependency; a changed result needs an explicit issuance-policy decision.
A permissioned token needs a testable answer to a simple question: why did this movement of tokens succeed?