Daniel Hernandez (born May 8, 1996), known professionally as 6ix9ine (stylized in all caps and pronounced "six nine") and also as Tekashi69, is an American rapper. His music has been marked by an aggressive style of rapping, while his controversial public persona is characterized by his distinctive rainbow-colored hair, many tattoos, extensive history of legal issues, and publicized celebrity feuds.

Hernandez first became known for his guest performance on Trippie Redd's 2017 single "Poles 1469", followed by the release of his debut single, "Gummo" that same year, which was a sleeper hit. The latter preceded his debut mixtape Day69 (2018), which was further supported by the singles "Kooda", "Keke" (with Fetty Wap and A Boogie wit da Hoodie), and "Gotti", all of which entered the Billboard Hot 100. "Fefe" (featuring Nicki Minaj and Murda Beatz), the second single from his debut album Dummy Boy (2018), peaked at number three on the chart. Despite negative critical reception, Dummy Boy peaked at number two on the Billboard 200 and received platinum certification by the Recording Industry Association of America (RIAA).

In 2015, Hernandez pleaded guilty to a felony count of use of a child in a sexual performance and received a four-year probation period and a 1,000-hour community service order. In 2018, he was arrested on racketeering and other weapons and drug charges. Facing a minimum of 47 years in prison, he pleaded guilty to nine charges including conspiracy to commit murder and armed robbery in February 2019. During the trial, Hernandez testified for the prosecution against other Nine Trey gang members and was sentenced to two years in prison. In April 2020, he was granted early release during the COVID-19 pandemic following fears over his vulnerability to the disease due to his asthma condition. He was put on house arrest for the remainder of his term and was released in early August 2020.

Hernandez briefly maintained commercial success following his release from prison; his 2020 single "Gooba" and its follow-up, "Trollz" (with Nicki Minaj) peaked at numbers three and one on the Billboard Hot 100, respectively. His second album, TattleTales (2020) debuted at number four on the US Billboard 200, while his third album, Leyenda Viva (2023)—his first reggaeton album—failed to make any worldwide chart impact. Due to his role as an informant in the Nine Trey Gangsters trial, several major hip hop figures and personalities have since condemned or ostracized Hernandez, leading to a severe decimation of his public image.