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Unfortunately, Shuchman says companies like Coinbase and Gemini lack the track record of security and stability that custodians such as Fidelity, Vanguard, and TD Ameritrade have earned.To implement a distributed timestamp server on a peer-to-peer basis, we will need to use a proofof-work system similar to Adam Back's Hashcash, rather than newspaper or Usenet posts.Three examples of popular decentralized cryptocurrency exchanges are BitShares, Altcoin Exhange, and Ethfinex. micro bitcoin bitcoin games...