feat: add MYRX-MAINNET (Chain ID 8472)

[MyRxWallet]

Add MYRX-MAINNET (Chain ID 8472)

Adds MYRX-MAINNET sovereign EVM chain (Chain ID 8472) to the built-in network registry.

Network: MYRX-MAINNET
Chain ID: 8472
RPC endpoint: https://rpc.myrxwallet.io
Block explorer: https://explorer.myrxwallet.io (EIP-3091)
Native token: MRT (MyRx Token, 18 decimals)
Status: Mainnet live 2026-05-07
Operator: MyRxWallet North America Corporation
Contact: developer@myrxwallet.io

Entry added following existing pattern:

Canonical chain data: https://github.com/MyRxWallet/mainnet/blob/main/chain/eip155-8472.json

[MyRxWallet]

Status Update — Chain 8472 (MYRX-MAINNET) is Live

Providing a status update for this PR:

Chain 8472 is fully operational as of May 2026:

• RPC: https://rpc.myrxwallet.io (2-node HA: NYC3 + SFO3)
• Chain ID: 8472 | Symbol: MRT | Decimals: 18
• Explorer: https://explorer.myrxwallet.io
• Block: ~64,500+ live | Block time: ~2s

EVM Compatibility confirmed: Full Solidity, Hardhat, Foundry, ethers.js v6 support. We have published @myrxwallet/sdk (npm install @myrxwallet/sdk) which wraps ethers.js v6 for Chain 8472 — validating full SDK interoperability.

Mission: Chain 8472 is healthcare infrastructure, not a speculative chain. It secures federally-mandated patient EHI under the 21st Century Cures Act. This gives it permanent institutional backing regardless of market conditions.

Developer Portal: https://myrxwallet.io/developer.html

Thank you for considering this addition — happy to provide any additional technical details needed for review.

— MyRxWallet North America Corporation (CAGE: 9VNZ7)