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 0x08211d1d6647cc83735ad0ec21c0ce03b0de91af79e2e8116303e2061e3e8c0b. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/54a85144-5dcd-48e9-abb8-e3b05779e21b.json and https://artists.proofprofile.net/proofs/artist/54a85144-5dcd-48e9-abb8-e3b05779e21b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
John Damgaard - Beethoven's Last Piano Sonatas Op. 109 / 110 / 111
John Damgaard Plays Beethoven, Chopin and Brahms
Beethoven, Chopin & Brahms: Works for Piano
Piano Sonata No. 6 in A Minor, Op. 164, D. 537: I. Allegro ma non troppo
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 0xaf7dca72305a8da220d75d130548a9966264cf96d14c310d6d5a82930ee8ebfe. 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/DKECA2557501.
Piano Sonata No. 6 in A Minor, Op. 164, D. 537: II. Allegretto quasi andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd73a47d95c543afe30b1cccc7dffa63cd598e1c81274a133c0a1a72a5e6a3562. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKECA2557502.
Piano Sonata No. 6 in A Minor, Op. 164, D. 537: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6edb31a8bab08e5c5702bcce3d482546d4eb64494771b34b659ea750444e665d. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DKECA2557503.
Piano Sonata No. 7 in E-Flat Major, Op. 122, D. 568: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0456ed9726c1475bfdea42f13a36dd3a70a0bdf649ac0da11828b7efd9b604b1. 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/DKECA2557504.
Piano Sonata No. 7 in E-Flat Major, Op. 122, D. 568: II. Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d9f5b892524c5a5a7e1913be1be1b4653d6f77e7dd6566b981f472b7e2d3eb. 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/DKECA2557505.
Piano Sonata No. 7 in E-Flat Major, Op. 122, D. 568: III. Menuetto. Allegretto - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2ea162adf857a196216a1b0229f5211df7cbb1d141a134ad385624b476ff27e. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DKECA2557506.
Piano Sonata No. 7 in E-Flat Major, Op. 122, D. 568: IV. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c298b624cf01179e99ea25c0c5304bca236c9343886843c5fd824a1291fa81. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DKECA2557507.
Piano Sonata No. 9 in A Minor, Op. 42, D. 845: I. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684064a1a6c1ecc26fa0870dec1610d84e7ae7121f4597d21ad2f5321d48ae10. 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/DKECA2557508.
Piano Sonata No. 9 in A Minor, Op. 42, D. 845: II. Andante poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a3afa539a13224845ef18d636f9727c35a5d5ba24baf9a6f166f543855af389. 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/DKECA2557509.
Piano Sonata No. 9 in A Minor, Op. 42, D. 845: III. Scherzo. Allegro vivace - Trio. Un poco più lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b77ba7277392d59b6b2007830de4d754db7b429cd2bcdbe2cffb1ff8f03b1ef. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DKECA2557510.
Piano Sonata No. 9 in A Minor, Op. 42, D. 845: IV. Rondo. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa826d6346a4881cf09858055edbd4bdd0d50b28fe8026b5eb2f2e4ead017ce54. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DKECA2557511.
Piano Sonata No. 5 in B Major, Op. 147, D. 575: I. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877cc51eb0eae20a6eb3c9773cab52a5475678120e47feffe31802d760fb0e62. 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/DKECA2557601.
Piano Sonata No. 5 in B Major, Op. 147, D. 575: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63fb447ec9fd92728a737377dae0fa50015a18e0c2ee679166a855391be4d8b. 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/DKECA2557602.
Piano Sonata No. 5 in B Major, Op. 147, D. 575: III. Scherzo. Allegretto - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62417f4357ae48db59cdc4fa97b1f5b5b3c3b012e3f77e517b7308f0aad95975. 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/DKECA2557603.