Experimente as seguinte fontes:
https://explorer.nucoin.com.br/files/blockchain/price_history.json
https://explorer.nucoin.com.br/files/blockchain/sponsors.json
https://explorer.nucoin.com.br/files/blockchain/latest_pool.json
https://explorer.nucoin.com.br/files/blockchain/wallet_history.json
https://explorer.nucoin.com.br/files/blockchain/blockchain.json
