# Migrating Legacy ERC20 OM Tokens

Part of the genesis 1,777,776 token supply for MANTRA Mainnet is a 1:1 mirror of the existing supply of legacy OMv2 ERC20 tokens, which have a capped supply of 888,888,888, and were the governance token of the now deprecated MANTRA DAO. These tokens were minted on December 17, 2020 in [this transaction](https://etherscan.io/tx/0x986c7f50a39f67c05b84885c0c4caea3fba61cd68d87a8b47114b70e6e2bddff).

This contract replaced [the original OMv1 ERC20 smart contract](https://etherscan.io/address/0x2baecdf43734f22fd5c152db08e3c27233f0c7d2) tokens, which were a mintable token with uncapped supply on the Ethereum blockchain that was minted on August 15, 2020 in [this transaction](https://etherscan.io/tx/0xbd76e418f7bd8e82eae027c548e07403b689cd112b92f12775aa1e9c2ce10e0a). We stopped facilitating the migration of the Old OM Token with the launch of MANTRA Chain in October 2024.

The [OMv2 token smart contract](https://etherscan.io/address/0x3593d125a4f7849a1b059e64f4517a86dd60c95d) remains on the Ethereum blockchain at 0x3593D125a4f7849a1B059E64F4517A86Dd60c95d. In accordance with [Governance Proposal 17](https://www.mintscan.io/mantra/proposals/17), which was passed on August 22, 2025, we will stop facilitating the migration of the OMv2 token on January 15, 2026 as noted on our blog [here](https://mantrachain.io/resources/announcements/erc20-om-deprecation).\
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At genesis of the MANTRA Mainnet, 888,888,888 mainnet OM were minted into the custody of our [one-way bridge](https://mantra.zone/migrate) contracts on MANTRA mainnet. These newly minted mainnet OM mirror the total supply of the Ethereum OMv2 tokens.\
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These migration smart contracts only release mainnet OM staking coins when a MANTRA/Ethereum linked wallet address successfully deposits legacy OMv2 tokens into the bridge deposit address.

1. The bridge is designed to ensure that legacy OMv2 tokens can be upgraded to mainnet staking coins while maintaining an accurate circulating supply.
2. The bridge can only release tokens IF the depositor has linked their Ethereum and MANTRA wallet addresses. If this registration has not happened, then the tokens will not be released on Mainnet.
3. As tokens are bridged across to MANTRA mainnet, the API used to report circulating supply for this bucket of tokens will ALWAYS equal 888,888,888 OM.
4. Transactions under 30,000 OM tokens will be released within 30 minutes on mainnet. Transactions over 30,000 OM tokens are subject to manual processing and may take up to 48 hours to process.

As the 888,888,888 legacy OMv2 tokens move to mainnet, their counterpart MANTRA mainnet OM staking coins are released to the MANTRA address linked to their corresponding Ethereum address. At the same time, the legacy OMv2 tokens are burnt by sending them to the 0x000000000000000000000000000000000000dEaD address on Etheruem. You can track the number of OMv2 tokens burned on Ethereum [here](https://etherscan.io/token/0x3593d125a4f7849a1b059e64f4517a86dd60c95d?a=0x000000000000000000000000000000000000dead).

You can find more information on the migration bridge [here](https://docs.mantrachain.io/using-mantra-chain/mantra-bridge).


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