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 0x5f7c75e223e684ed1ee540948acb8a4ef8ff1cd8247b61cd5b383cf1481810fa. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b89908af-ecf6-48e0-8188-a0f9cf45dd65.json and https://artists.proofprofile.net/proofs/artist/b89908af-ecf6-48e0-8188-a0f9cf45dd65.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vanhal: Missa Solemnis in E-Flat Major, Stabat Mater in F Major & Symphony in D Major, Bryan D4
Missa solemnis in E-Flat Major: VIa. Agnus Dei
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 0x103774863f8c2489dee843ce7e2b6a3c55057a693901d9ecc907f016733074bb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB959535316 — a six-check JSON result.
Dvorák: Svatební košile (The Spectre's Bride), Op. 69, B. 135
Jakobín, Op. 84, Act I: Act I: Introduction
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5848fa5035b0d406984659ceb6584c106bc5941bd925bfd1d4d3fc054d062526. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464101 — a six-check JSON result.
Jakobín, Op. 84, Act I: Act I Scene 1: Sve hlavy v prachu sklanime (Chorus, Bohus, Julia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb89d5745e2a3d2151961005f71c7c50bcfaf91c8aa7f1610a78ff7eb4431458e. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464102 — a six-check JSON result.
Jakobín, Op. 84, Act I: Act I Scene 2: Jen postujme tu okamzeni (Chorus, Children's Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe235be2341cac51b7c0246093e389d06884d009e7a797e31d8bb34c7565081fe. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464103 — a six-check JSON result.
Jakobín, Op. 84, Act II: Act II Scene 1: Serenade (Benda, Jiri, Terinka, Chorus, Children's Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd127bf67586db17eaae2c39990a1931ec11822e087947a427c1eb17b5e5ee74. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464114 — a six-check JSON result.
Jakobín, Op. 84, Act I: Act I Scene 3: Uceny pane, dobry den! (Benda, Terinka, Jiri, Filip)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe93179ed310226d9c107adb64001de8bf44580bd0895c61c2c2d0a18e3759aaf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464104 — a six-check JSON result.
Jakobín, Op. 84, Act II: Act II Scene 2: Ach boze, bozinku (Terinka, Jiri)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x805af0197a6dab31278a157fcb032f445eb3c156a718df6d1904355d68823266. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464115 — a six-check JSON result.
Jakobín, Op. 84, Act I: Act I Scene 4: Zle je, zle je, ha, ha, ha, ha! (Boys Chorus, Jiri)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dbc79ec2bf61ebad6e33911847077bd6940a6f2cfd8550bbc05d5d246c7e19f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464105 — a six-check JSON result.
Jakobín, Op. 84, Act I: Act I Scene 5: Ja stastne, se ho zbavila (Terinka, Jiri, Filip, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689916988d5c4631e8a2f6ac80e57faa726234d5bc4a50f8748ac80e1c1c70a5. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464106 — a six-check JSON result.
Jakobín, Op. 84, Act I: Act I Scene 6: To mne stat! Tak ctite pana! (Filip, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7651a69caee4b72614135356dc3581aac764614101b2cb32686040f12473d571. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950464107 — a six-check JSON result.
Dvorák: Svatá Ludmila (Saint Ludmila), Op. 71, B. 144
Dvořák: Čert a Káča (The Devil and Kate) Die Teufelskäthe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2da6e29b31c563cc73303f11e3e0fa59d56bf61803c9b4d6c68cd6c3ac4ac20. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950877701 — a six-check JSON result.
Čert a Káča, Op. 112, B. 201, Act I: Act I: Proc tak brzy, ovcaku (Farmhands)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f09b22a5b38f3a385f819e37be86e5ceb8abec1f6393ab96ecbaf3809b4002. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950877702 — a six-check JSON result.
Čert a Káča, Op. 112, B. 201, Act II: Act II: Hellish Dance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7527523064018c65d73b7aca9539c020db5740670f9ab1ffdf77dccb4777e880. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950877720 — a six-check JSON result.
Čert a Káča, Op. 112, B. 201, Act I: Act I: Je sic to trochu daleko (Marbuel, Kathe, Chorus, Mother, Jirka)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19778fc8beb924984bfa6cddb9ded8afba72a018410143e22d47352e5ac18593. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB950877712 — a six-check JSON result.
Haydn: Missa Cellensis - Jommelli: Te Deum & Mass in D Major
Armida, Op. 115, B. 206, Act II: Act II: Vorspiel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e977410fc1a470fbaaaa186b926876f018773003b8c2fe0304aeb1914b289b9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB959540408 — a six-check JSON result.
Atterberg: Sinfonia Visionaria - Alven (The River)
Beethoven: Egmont, Op. 84 - Reicha: Lenore