thumb| Emmanuel Rossfelder (born 1973) is a French classical guitarist. Life Rossfelder started playing the guitar at the age of 5. He started as a student of Raymond Gellier. At the age of 8, he
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 0x5ccb6a38e2d2272d4545690493ab307d856278ba1fa5e34520f8d1fbc98cc598. Chain 2 (Bitcoin): anchored in block 953614 (2026-06-14T08:40:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/149cf497-4e7f-4ce1-943d-eb49233fe72f.json and https://artists.proofprofile.net/proofs/artist/149cf497-4e7f-4ce1-943d-eb49233fe72f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Danses pour Cordes - Works for Guitar & Cello
Kinderszenen, Op. 15: VII. Träumerei (Arr. for Guitar by Emmanuel Rossfelder)
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 0x45a6667b452a2cb8ffd0dfeca359ef522d627089ba4bfe479c3aad6dc0092602. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/FROV62513910.
Siete canciones populares españolas: V. nana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d745d5d7387729db943e13024667e25bb3f1f795b44ce9025f487474164abb5. 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/FROV61410402.
Siete canciones populares españolas: IV. jota
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f1ba4a26350dd61ccc457fc63e790fafe41b0ff148a29aa7702f057adfb5b6. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:29:13Z), 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/FROV61410401.
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
La vida breve: 1ère Danse espagnole (Adaptation M. Laignelot)
La Folle Journée 2019: Carnets de voyage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28cdcc1e90d6a6c517ec76daa5d137c21ab1dc6183bf94d7dd919b5c8f87914. 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/FRU621845804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc927dda71e4e4e8cb0ab3fd6d9f41e15c7f28ced1b828fbfdceb2b6b0358ad. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FROV61410403.