Eth address withdrawals/deposits

[Jan-Jan]

Background

We want Eth address withdrawals/deposits working seamlessly with CEXs & Wallets working seamless as part of the SCC on Polkadot from the beginning. This is decrease the friction of users and developers from Eth adopting Polkadot.

Scope

• design doc (showing trade-offs)
• identify & stack rank CEXs
• identify & stack rank Wallets
• implement solution (in Sidecar)
• update docs
• communicated to all Wallets & CEXs
• adoption by Wallets (above watermark)
• adoption by CEXs (above watermark)

[albertov19]

A bit more context in this issue #1660