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 0x86975bf668f22f3f6bda13e8a33de1da4283d9798437d973329caba228dc1ef4. Chain 2 (Bitcoin): anchored in block 953600 (2026-06-14T06:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e6588a4-4215-4ea4-aeb5-68eed62ca3e5.json and https://artists.proofprofile.net/proofs/artist/0e6588a4-4215-4ea4-aeb5-68eed62ca3e5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
3 Studies for Piano, Op. 18, Sz. 72: No. 1, 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 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 0xd334f6846d03a335543a0d7c9b2593010ec1723ae86d089ba2cdcbbeb84e7f55. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105501 — a six-check JSON result.
3 Studies for Piano, Op. 18, Sz. 72: No. 2, Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc65f9103d93a5fa1838dc34d8c32406366441839465181659b139044cc5375a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105502 — a six-check JSON result.
3 Studies for Piano, Op. 18, Sz. 72: No. 3, Rubato - Molto sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc1a76e0913a7eed6bcb1291937d53bd56b8001d5a5bcac277094731fb3a30b. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/HKI192105503 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde9a4e50796276ad3ef7ea965dae2a53c0fbca3203baeac117eea5a84918ad12. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105504 — a six-check JSON result.
For Children, Vol. 2, Sz. 42 (Excerpts) [Original Version]: No. 25, Eve Eats an Apple. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe85deb4c336b2a0cd41e1292d458372022d53e70802a116d4d533499b6f169. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/HKI192105505 — a six-check JSON result.
For Children, Vol. 2, Sz. 42 (Excerpts) [Original Version]: No. 29, Dinner at My House. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cf66b99904e6a34cd694ec63fd7b115e827a5a97caaec78e09b417eba66c70. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/HKI192105506 — a six-check JSON result.
For Children, Vol. 1, Sz. 42 (Excerpts): No. 17, The Young Bride. Adagio [Original Version]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda4f8de59246b1025aac2664cacb010770da68fb5022a83f3bf2aff205c311e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105507 — a six-check JSON result.
For Children, Vol. 2, Sz. 42 (Excerpts) [Original Version]: No. 26, Dance with Me. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbe27127b4f44e0a008d7191192f123b9b768932644006d1198969ef6cf4eac. 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/HKI192105508 — a six-check JSON result.
For Children, Vol. 2, Sz. 42 (Excerpts) [Original Version]: No. 34, Evening Kiss. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a4d1e66566b4d22effcd6c470f65c91da984bfb5b2d103d47dedaaac8ed0bc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105509 — a six-check JSON result.
For Children, Vol. 1, Sz. 42 (Excerpts): No. 21, Vigoroso. Allegro rubusto [Transcr. F. Ránki] [1945 Radio Version]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18f7c48415fac32310df9c97fd30f14ab83683f9e9cf08d9e3cb573802a07c8. 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/HKI192105510 — a six-check JSON result.
For Children, Vol. 1, Sz. 42 (Excerpts): No. 26, Dance with Me. Andante [Transcr. F. Ránki] [1945 Radio Version]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bb05da197540c47b39630d84a864d87cf9c002b647c405c50cf4889da6212c. 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/HKI192105511 — a six-check JSON result.
For Children, Vol. 4, Sz. 42 (Excerpts) [Original Version]: No. 65, The Old Shepherd. Molto rubato, non troppo lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7270f9335265e9e25dec99b308334e315123a182a38c126921892d5bddb36dd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105512 — a six-check JSON result.
For Children, Vol. 4, Sz. 42 (Excerpts) [Original Version]: No. 69, High Spirits. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d8ab039f5614bff6fac6782f3d2c2be6d9f3d1e2e80878822148546cfabf99b. 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/HKI192105513 — a six-check JSON result.
For Children, Vol. 3, Sz. 42 (Excerpts) [Original Version]: No. 47, Bird of Flight. Molto andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7cd7464d19d111d674b6112854dabbacc937346a130fb7a3a9918ec93b04630. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105514 — a six-check JSON result.
For Children, Vol. 3, Sz. 42 (Excerpts) [Original Version]: No. 53, Sweetheart, Wait for Me. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ac4e9406165448422ff37c1aeba8dbcef37e3c077304c38b78c2b56565e4b2. 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/HKI192105515 — a six-check JSON result.
For Children, Vol. 4, Sz. 42 (Excerpts) [Original Version]: No. 78, Roses for My Sweetheart. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033bd61ec86c5c2648308f095ae06a034e296257f33ac6a44181f62b763e1b61. 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/HKI192105516 — a six-check JSON result.
For Children, Vol. 4, Sz. 42 (Excerpts) [Original Version]: No. 79, On the Banks of the Danube. Molto tranquillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d47b3f657410ecbb3604691b5534fba2864e37bfcf6b8348834931a863130b. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/HKI192105517 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb7ad2b531eb5294b99475c9fd66bebb5e97faed3137521bebe758355f7fa08. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192105518 — a six-check JSON result.