Julia Hagen (born 1995) is an Austrian cellist who made an international career as both a soloist and a chamber musician. She has performed at festivals such as the Menuhin Festival Gstaad, the Salzbu
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 0x24ef5cf321dc5a74fc6804ad82dbf4980c832a91585597db3d71dfbbb238ff60. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cae42f99-8207-488f-a110-6b33789472c0.json and https://artists.proofprofile.net/proofs/artist/cae42f99-8207-488f-a110-6b33789472c0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Villa-Lobos: Bachianas brasileiras No. 5, W389: I. Ária. Cantilena
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 0xbead764136533cc2ec01c14073d2c4b8da27738d97d232a3240e8446b7c24d1b. 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/GBAYC2200173.
In the Hall of the Mountain King (From "Peer Gynt", Op. 23)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f55031ab14bfa97d8af952b4e53f9a5c32801bb9f83fb3eec88a769a19442c3. 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/GBAYC2200175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02250ded9f061dbc43d53cc0b7091a44d781ed0cb3058b2186baccc92bcac78f. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/GBAYC2200174.
Piano Quartet in C Minor, Op. 13: II. Scherzo. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5d75379fea12cf2a4ab42fcd35beb027ceca8c09d961b7b619092999c5a3aa. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEN962530409.
Piano Quartet in C Minor, Op. 13: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc96117de5a150f7677a89d2c3a8da03999f090562b79f4205be1f70e3f99b1c. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/DEN962530410.
Elégie, Op. 24 (Version for Cello and Orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6dbf5ef02b05a228839c90e774ce0e26425786bfbdd9dfc7fefb9e1b15c2972. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEN962400406.
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
Six Songs: Wie Melodien zieht es mir op. 105/1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc258ed6b0c7b13793fee6d475821d0ffad14cc983c5328441b7cd748fde22abe. 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/DEAD61823605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f1382a7f49afdf59acc1585ea0f895a459d90a27e66dabb2911b5498f35d584. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/DEAD61823606.
Sonata Op. 38 E Minor: Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2f3e30ff36452564621267fb0d68dcd7ef84e699111e4bc959f8f13bf128b1. 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/DEAD61823607.
Piano Quartet in C Minor, Op. 13: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e1ca47125fbea0feeb447a670a568cbc0127d628bc21834e17db0c80135d18c. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/DEN962530408.