thumb|Portrait of Michael Haydn by Franz Xaver Hornöck center|frameless|upright|alt=signature written in ink in a flowing script Johann Michael Haydn (; 14 September 1737 – 10 August 1806) was an Aus
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a1c4bce2f059dd106d97d0a0bed6e2cb524bf221002edd382e5c0e75e1e3e0b. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c788212-6a50-4506-b787-896c97bcc45e.json and https://artists.proofprofile.net/proofs/artist/7c788212-6a50-4506-b787-896c97bcc45e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Missa Sancti Hieronymi: III. Gloria. Allegro molto
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe728dca8d91309b05b5c7203d4a46873c75a6e493902e1e2aa5285cb10ddd48b. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/SEAEI9759030.
Missa Sancti Hieronymi: VIII. Agnus Dei: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff2a14bfce25837cc3bfb63e911498e551882b453ca006b5736f4c0aa15428d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/SEAEI9759080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa966872ffd918fbf48a278697852b7d598cc27425fe23d5ec4ae082a9a35b6c1. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SEAEI9759100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x731058c75d7a5838a0d0c564869961b6c504f6814d476fef0e3708ab0202ebe8. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SEAEI9759110.
Missa Sancti Hieronymi: I. Kyrie. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a96bc4a14371e7680c0ee8115875c6f59173340eae51cab3e2f9839a5ac7cfd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/SEAEI9759010.
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
Missa Sancti Hieronymi: II. Gloria. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb661e495101fcd8929bda039c76bdbcd99064ed19fe11b241ddd64b1eaa209b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/SEAEI9759020.
Missa Sancti Hieronymi: IV. Credo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37b25acf55105926bad466e0baec890ed3a17e988f8ced6c461ae030cbdb6a8. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/SEAEI9759040.
Missa Sancti Hieronymi: V. Et resurrexit: Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac5e2d9d0913ebf028b075d4b71307bd706bbc9b7c4d274cfffd8638c35e50f. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/SEAEI9759050.
Missa Sancti Hieronymi: VI. Sanctus: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9831a94dc4a602f831f42d8c085c71d074f77395607b17d42191ef433a88cb9. 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/SEAEI9759060.
Missa Sancti Hieronymi: VII. Benedictus: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42bbe613c4074d9c61b8d97b8366453aee9a328b0f9a88698cd44b860f838c9. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/SEAEI9759070.
Missa Sancti Hieronymi: IX. Dona nobis pacem: Allegro Brioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cf526ca14999dbb7b71f13663d6c600dc7877d74453b2a2e003bc7d48f4b211. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/SEAEI9759090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d98c9aacd8124d7b38f24bb02e05fa4b897002cdf0f80e47e4753e5c003d5e. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/SEAEI9759140.
Haydn, M.: Missa Sancta Theresiae / Te Deum
Haydn, M.: Concerto for Organ, Viola and Strings, P. 55 / Symphonies - P. 9, 27, 33
M. Haydn: Die Ährenleserin, MH 493 & Ninfe in belli, MH 73
Michael Haydn: Complete Wind Concertos, Vol. 1
Haydn, M.: Hochzeit Auf Der Alm (Die) / Der Bassgeiger Zu Worgl
Michael Haydn: Andromeda e Perseo, P. 25 (Sung in Italian)
Haydn, M.: Notturnos in C Major / F Major / G Major
Flute Concerto No. 2 in D Major, MH 105: Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x982e9ed98058f53974acd53fdd76c9c97e14556111acf1f12448c254c88c6709. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/HUA253286503.
Violin Concerto in A Major, MH 207: Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f9472831d8c546721cea0a5a587cfa5af83960f2137f6dc689a52ba45612e2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HUA253286505.
Flute Concerto No. 2 in D Major, MH 105: Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e96c3e5700aa140c6de2e1624f4798a36a18e6fc882e7291ba10655f2563b1. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HUA243286501.
Michael Haydn: Vocal & Instrumental Works (VRT Muziek Edition)
Missa Tempore Quadragesimae, MH 553: I. Kyrie - VRT Muziek Edition
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07865cf0f6f51834b9d82c0ed61fb45cea2142125a61a83a11b280ae08a471dd. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BEA032400391.
Divertimento in A Major, MH 299: II. Menuetto (moderato) - VRT Muziek Edition
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x766148b93f2d18244743281df1d7a43a9c199bab54839ed1f827ca96cb432517. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/BEA032400400.
Missa Tempore Quadragesimae, MH 553: II. Credo - VRT Muziek Edition
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1b2509b3c7d8d95375dbcdefd68ef0418a4057fb52098c89ee25f2502171fd. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/BEA032400392.
Trumpet Concerto in C Major, P. 34: II. Allegro molto
Baroque Trumpet (The Art Of The), Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bfa8965543d3645b8fafbce6b71aa4ce88242ce06394b6edcdd70c4e48b9981. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKI199939305.
Haydn, M: Trumpet Concerto No. 2 in D Major, MH 104: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d5066d7385d9af5dfdeae0cf397c6a20580eb80f8e94ba381e8320076c42cc. 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/GBAYC8703812.
Haydn, M: Trumpet Concerto No. 2 in D Major, MH 104: II. Allegro (Cadenza by Maurice André)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeacceb3814c9e9866de04f53b09d3f07264e27b08310a6cc2bb474a476b134e. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC8703813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d5066d7385d9af5dfdeae0cf397c6a20580eb80f8e94ba381e8320076c42cc. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBAYC8703812.
Trumpet Concerto in C Major, P. 34: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b1ab93269a586893df399082513a940e34d5ef05eb65a902e1418dc4f38027f. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/HKI199939304.