first draft coinbase call

EIPS/eip-coinbase-call.md

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+---
+eip: <to be assigned>
+title: Coinbase calls
+author: Ricardo Guilherme Schmidt (@3esmit)
+discussions-to: https://ethresear.ch/t/gas-abstraction-non-signed-block-validator-only-procedures/4388/2
+status: Draft
+type: Standards Track 
+category: Core
+created: 2020-01-19
+
+---
+
+## Simple Summary
+
+Allow contracts to be called by validator/miner (`block.coinbase`) without a transaction.
+
+## Abstract
+
+Validators/miners can choose become Gas Relayers to pick up fees from meta transactions, they do so by signing a transaction wrapping the meta transaction. However this brings an overhead of a signed transaction by validator that does nothing. This proposal makes possible to remove this unused ecrecover.
+
+## Motivation
+
+In order to reduce the overall overhead of gas abstraction.
+
+## Specification
+
+The calls to be executed by `block.coinbase` would be included first at block, and would consume normally the gas of block, however they won't pay/cost gas, instead the call logic would pay the validator in other form. 
+
+Would be valid to execute any calls without a transaction by the block coinbase, except when the validator call tries to read `msg.sender`, which would throw an invalid jump.
+
+Calls included by the validator would have `tx.origin = block.coinbase` and `gas.price = 0` for the rest of call stack, the rest follows a normal transactions.
+
+## Rationale
+
+TBD
+
+## Backwards Compatibility
+
+TBD
+
+## Test Cases
+
+TBD
+
+## Implementation
+
+TBD
+
+## Security Considerations
+
+TBD
+
+## Copyright
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).