{"issuer":"Audexum (audexum.com)","signed_label":{"alg":"Ed25519","public_key_base64":"IRaMKO04iCmIiyS5yUcBD08An/ngNN+4rg5o/uhSJ3Y=","where":"audio metadata comment (RIFF ICMT, ID3 TXXX:comment, Vorbis COMMENT)","format":"audexum-provenance=v1.<base64url payload>.<base64url signature>","payload":"<YYYY-MM-DD>;<4 hex digits: vendor byte 0xAD, account bucket byte>"},"watermark":{"method":"AudioSeal (Meta, MIT), 16-bit, detector audioseal_detector_16bits","presence_threshold":0.5,"message":"vendor byte 0xAD + account bucket; not reliable after lossy compression"},"detector":"https://audexum.com/detect"}