Leonhard Lechner (also Leonard, 15539 September 1606) was a German composer, kapellmeister, tenor and music editor who was taught by Orlando de Lassus. He added Athesinus to his signature, referring
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88f686c303e22ace041fda668b071b2694c2fbec6c78564bb6d558bf3a673f1. Chain 2 (Bitcoin): anchored in block 954025 (2026-06-17T00:32:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/383f883e-7e26-46be-b9e3-de8e2ffeb77d.json and https://artists.proofprofile.net/proofs/artist/383f883e-7e26-46be-b9e3-de8e2ffeb77d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Swedish Tongues: An Anthology of Choirs (1900-1950)
Jul, jul stralande jul (Christmas, radiant Christmas)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd17fa071d0e20c3028be2d9920b57830493f403f8d894226469107d409aec351. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAGA0022260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c6ebf31c1292d5f8555e64059ae7bd3dfafdb691ce8469982b67109fc218dc. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE479300140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb942f808a4e53c7597f517571fdbca7a20ea4c12fa9952ecde50c5a87c8bcde1. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE479300145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cdab1e31220c0635b2cab704ad8f2f1a89d10f580f4758530f3db9c26e5e06e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE479300139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e875b5b686693b74f6681955dbb303a8f06662ba1447280fcb0b09eb6f72802. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE479300148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bd19a69c010f43a54beb853bf2483af896b92782c75905dbf302b77190bcdf. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE479300142.
Ein feste Burg ist unser Gott (Arr. M. Lewon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90ddc9c51f7b0503ad978fc537e68eba8f9c60cf152180842f35cd5cbd4d41f7. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB901700901.
Aus tiefer Not schrei ich zu dir (Arr. M. Lewon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc2f4b67f240968e6b759f14d4034269ac87a41073038e06b916047f6d9b0b8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB901700902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad690b5fcc8ad6f1a7cc1f9dfb5cb35c0f32da1084ce5f93c706ee1a6b5ed48. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB901700907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266abc0531938c5d5a16f4d236c83d15adfa4e84b28c6bb8eb680b4e0b542bc9. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB901700914.
Geistliche Chormusik, Op. 11: No. 12, Also hat Gott die Welt geliebt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be489dcf890a84878fb5676acb2f955ef03f0ec82666200f8f54793a470f333. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380020176.
Leonhard Lechner: Mein süße Freud auf Erden. Sacred Choral Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6760ddbd4ad745e8067ea97dd8b9e358d7b170608c8ee887e3134269f0592efa. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe37069431d60b0ae8cf03332bbc4f1673be1652244032039ce1d4d7fe5d5693. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe08aa74cd3c5581d668d954e48f6fa0393c39f7700b2f653b31fcd896d9f84. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36fab2de940c80e7b266eb63e2ad4b1c56c2c944edc2546ca1a77273f17c2d2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeffc52192464118be9eadfd905fe870c4f2716799f307b8fba8b3cd884ae1b37. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5c1f420051966283f35493654c86eaf8c4cddcbf353a25635e86ae73150618. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6444d8c8c551ac679215b3a6bda8463dbf09e43c508e380b989766125553aaf5. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a58a96e230b29b1095fc6eacff4517e3795a8a00b44bc7ad55fc35fda4f91c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2f810ad3427a383193e109f837ff3eeece7cc15ac7d142f49b13313065c4c7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828d86e1fae2c4764321a2561c4d575625f0d01be032608bb1c9c18282342f26. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bfa5021654aa516d2090bf60e0d60ecbb109eb9cf7aaf24d9a8d4c9d41743b2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM81350115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd07133e02e0aab70e37d0deaad55159390b3667bd005897cb929e6c61cbf96. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1076477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4568e5b4efe3de3f4c59f620360e96452aded970c2ba01010caa809041541c16. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1076485.
La bella Ninfa (Europäische Madrigale um 1600)
2nd Book of Madrigals for five Parts: Ecco mormorar l'onde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6425227e6b26599d910d952f3d58aff17bd9ae4ebbc174d660258aef7984a50. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380011149.
Te Deum laudamus: Music on the Freiberg Cathedral Angel Instruments from 1594
Missa super mon coeur se recomande: Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a25fbf678d46ff761270328655cf496f0d6008c33f910aedcf3bad980e7899. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB201392809.
Choral Concert: Die Nacht leuchtet wie der Tag / The night shines as the day
Gyri gyri gaga: German Renaissance Songs of Lust and Life
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4af132954fa5b921e2d5857d00ea23491af698650b5adae0d52fa22587bdd3f. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB900900801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2383832458a353287fa780e6fa150bd92fb66a74bfd9bf509983e65d37df682a. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB900900806.
Die liebe Maienzeit (Folk songs and convivial choral songs from the 16th century)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x233d063f8ba0bf4eef7c82e6f316c50d76597d3f8d2964f83c2c592c34db19e1. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380019695.
Felis & Gabrieli: Maria Magdalena - Renaissancemusik aus Nürnberger Handschriften
Kreuzchorvespern (Geistliche Musik in der Zeit der Trauer und Zuversicht)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f6d5548e0124d5d2bc4c3e8a037427d53fdc50135280011e80f0e4b42d4dbd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DES380020340.
Song Of Songs (The) - Settings From Different Centuries
Dolcissima mia vita (Choral Music from the Sixteenth Century)
Aus der Stille kommend (Live von der Loisiarte 2019)
Wenn Engel musizieren I (Geistliche Musik - Musikinstrumente von 1594 im Freiberger Dom)
Was wird es doch des Wunders noch - Vocal and Instrumental Music from German Renaissance
Niederländische und Deutsche Motetten des 17. Jahrhunderts (Mono Version)