The Piper Merriam Collection

Owner-controlled dynamic-array member registry.

Owner-controlled member registry with array + mapping tracking.

An Ethereum Public Trust roster contract for adding, removing, and checking members.

Test/utility contract with `suicide(address)` kill switch and a `multiply2` helper.

Owner-controlled member registry using sequential id + mapping storage.

The first deployment of Piper Merriam's Ethereum Alarm Clock, a smart contract protocol for scheduling transactions at future block numbers, launched on Septemb

The bonded caller pool of the Ethereum Alarm Clock: callers post a bond, take turns being the designated executor, and forfeit it if they miss.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

The second contract deployed by Piper Merriam on September 22, 2015, within hours of the Ethereum Alarm Clock v1, representing the first same-day iteration of t

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

The bonded caller pool of the Ethereum Alarm Clock: callers post a bond, take turns being the designated executor, and forfeit it if they miss.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

The bonded caller pool of the Ethereum Alarm Clock: callers post a bond, take turns being the designated executor, and forfeit it if they miss.

The scheduler of the Ethereum Alarm Clock: it holds deposits, records calls against a future block, and pays whoever executes them.

The bonded caller pool of the Ethereum Alarm Clock: callers post a bond, take turns being the designated executor, and forfeit it if they miss.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

An onchain sorted index by Piper Merriam: a self-balancing tree that answers first-above and first-below queries over stored values.

An onchain sorted index by Piper Merriam: a self-balancing tree that answers first-above and first-below queries over stored values.

A Solidity date and time utility library deployed by Piper Merriam on October 6, 2015, providing functions to parse Unix timestamps into human-readable date com

An onchain sorted index by Piper Merriam: a self-balancing tree that answers first-above and first-below queries over stored values.

The scheduler of the Ethereum Alarm Clock: it holds deposits, records calls against a future block, and pays whoever executes them.

The bonded caller pool of the Ethereum Alarm Clock: callers post a bond, take turns being the designated executor, and forfeit it if they miss.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

A call forwarder from the Ethereum Alarm Clock: it relays a call to any address, and only the scheduler that created it may ask.

A Solidity string utility library authored by Piper Merriam and deployed on October 12, 2015, providing functions for converting between unsigned integers and s

A string and bytes conversion library, deployed 21 October 2015.

An ordered index library for contract storage, deployed 21 October 2015.

An ordered index library for contract storage, deployed 21 October 2015.

An ordered index library for contract storage, deployed 21 October 2015.

A string and bytes conversion library, deployed 2015-10-21.

An ordered index library for contract storage, deployed 2015-10-21.

The library that rotates the Ethereum Alarm Clock's pool of callers

The library holding the Ethereum Alarm Clock's call database and payout accounting

The first Ethereum Alarm Clock, a single contract holding the whole scheduling service

The Relay from Piper Merriam's Ethereum Alarm Clock, created by the scheduler itself to forward one call at a time.

A balance accounting library with withdrawal safety, deployed 2015-10-22.

The first Ethereum Alarm Clock, redeployed four hours later against a new accounting library

An ordered index library for contract storage, deployed 22 October 2015.

An ordered index library for contract storage, deployed 22 October 2015.

An ordered index library for contract storage, deployed 22 October 2015.

A balance accounting library with withdrawal safety, deployed 2015-10-23.

An ordered index library for contract storage, deployed 2015-10-23.

A string and bytes conversion library, deployed 2015-10-23.

A rotating pool of participants that turns over on a fixed schedule, held in a library

The library holding the Ethereum Alarm Clock's call database and payout accounting

The first scheduled-transaction service on Ethereum, enabling smart contracts to schedule future function calls—deployed by Piper Merriam in October 2015.

Balance bookkeeping for the Ethereum Alarm Clock, held in a library

An ordered, queryable index over contract storage, held in a library

String comparison helpers, held in a library

The call lifecycle for the Ethereum Alarm Clock, held in a library

A rotating pool of participants that turns over on a fixed schedule, held in a library

The scheduling logic for the Ethereum Alarm Clock, held in a library

The Ethereum Alarm Clock entry point, which creates one contract per scheduled call

A single scheduled call, created by the scheduler and waiting for its target block

Balance bookkeeping for the Ethereum Alarm Clock, held in a library

The call lifecycle for the Ethereum Alarm Clock, held in a library

The scheduling logic for the Ethereum Alarm Clock, held in a library

The Ethereum Alarm Clock entry point, which creates one contract per scheduled call

Test contract for Piper Merriam's Ethereum Alarm Clock, deployed December 2015. Verifies the scheduler can execute set/register/do calls correctly.

A single scheduled call, created by the scheduler and waiting for its target block

A liveness canary for the Ethereum Alarm Clock, deployed 26 December 2015.

A liveness canary for the Ethereum Alarm Clock, deployed 28 December 2015.

A liveness canary for the Ethereum Alarm Clock, deployed 31 December 2015.

A liveness canary for the Ethereum Alarm Clock, deployed 3 January 2016.

A liveness canary for the Ethereum Alarm Clock, deployed 3 January 2016.

A liveness canary for the Ethereum Alarm Clock, deployed 5 January 2016.

A liveness canary for the Ethereum Alarm Clock, deployed 5 January 2016.

A liveness canary for the Ethereum Alarm Clock, deployed 7 January 2016.

The execution and payment engine behind Piper Merriam's Ethereum Alarm Clock, which paid strangers to press a button at a future block.

The scheduling half of the Ethereum Alarm Clock, carrying an on chain ordered index so pending calls could be found by block.

The Ethereum Alarm Clock Scheduler contract by Piper Merriam — one of the earliest utility smart contracts on Ethereum, enabling time-based scheduling of future

A liveness canary for the Ethereum Alarm Clock, deployed 31 January 2016.

A liveness canary for the Ethereum Alarm Clock, deployed 31 January 2016.

A heartbeat contract that proves the Ethereum Alarm Clock is still executing calls

A heartbeat contract that proves the Ethereum Alarm Clock is still executing calls

A liveness canary for the Ethereum Alarm Clock, deployed 1 July 2016.

A liveness canary for the Ethereum Alarm Clock, deployed 28 July 2016.

The transfer and allowance logic of the Devcon 2 attendee token, kept in a library

A non-fungible attendee token minted at Devcon2 in September 2016, one per named identity, a year before ERC-721 existed.

Signature recovery library for the Devcon 2 attendee token

Event emitter library for the Devcon 2 attendee token

Signature recovery library for the Devcon 2 attendee token

Event emitter library for the Devcon 2 attendee token

Event emitter library for the Devcon 2 attendee token

An ERC-20 token deployed by Piper Merriam for Devcon2 attendees that served as an early on-chain proof of attendance.