Public identification

Blocks built by BuilderNet nodes expose these key identifiers:

Identifier	Description
Extra data	`BuilderNet (<Operator>)`
Coinbase signing key	For signing the block and the proposer payment transaction. Also to accrue MEV value, which is later redistributed to users. Currently the coinbase signing key is common across builder instances and has the address `0xdadB0d80178819F2319190D340ce9A924f783711` (ENS: `buildernet.eth`).
Relay submission keys	Two BLS keys are used by each builder instance to sign bids submitted to relays, one for optimistic mode and one for non-optimistic submissions. These keys are unique per builder node.
Refund transactions	Refunds are sent from address `0x62A29205f7Ff00F4233d9779c210150787638E7f` (ENS: `refunds.buildernet.eth`)

Operator	Signing key address
Flashbots (regular)	`0x850a00ffd1319a04114cff3793f8403ccbf026e0cf67ddca2f9fbb1a03e056a916becc686cdfe7714b111e35c92a74cf`, `0x853a00a74af90ee4ef4f7f41adafa010327e615036000b29711c65877a0eb77665c840b4869bd6208fc03486c097b9c4`
Flashbots (optimistic)	`0x850b00e055388c1b56f137e0852bc02d8b05534e9f96dd1d11cff8cf0481b800ecc2e708cdc158cd95b7cfdaa6840ee7`, `0x853b0078c722ade5dd089dd9ce2eea3890dcc825213231600b3023ab92aa3e835c5325f31515b82a9a0559c881a14cde`
Nethermind (regular)	`0x851a009553c46cae9384ebc59dcf17064ee8839de085910ec71d834ab1b8dc7a1f3271008c2438ae3b3e44be994108a6`, `0x856a005086a7885e932e3d51feb86cf33a0d34bdc61e517b6b5742246567899b892ee2a1d58362983d63bb36ac7b9a28`
Nethermind (optimistic)	`0x851b00b12f73770337fbd219b439aba7bd8e770dbdea16a3b0df030d971bc0d824d470d7868e5d93355f501bfe892947`, `0x856b00042301181ccf5277309c6f44595e343a284187bfe9868d6812e46fba21831fecbe8b0e6814c1463ba540ac3f46`
Beaverbuild (regular)	`0x852a00817dd13ce36535855192e218ccad6d489f90605c501fd4294940550592426552006ebd44f0e661b73d58a9765c`, `0x855a0059904005096586fe3b8ae5faa1a630947c5ff517b788100121db18a8961ee40b2ff47139b5b0965a5a0d8fe1af`
Beaverbuild (optimistic)	`0x852b0070e2522fcb06dcb159fabcdc7a4b5e1221cc2a56b083577cce03e50afe1b699c5a1111eb3bb1b8684aa90a8333`, `0x855b00e6b2c5dd524d2689bd43e0a965262810cbd7a2c71166f53594fb01bba8151bdd6a09ddb0408f7063b17eb3742e`