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 0x191e0027812153cefecb1049ac2bb3b3fb950ccd8233fda55ce73d820d368eee. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac2db2fa-1b1a-4591-95e5-680ef4c7432d.json and https://artists.proofprofile.net/proofs/artist/ac2db2fa-1b1a-4591-95e5-680ef4c7432d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schobert, Schröter & Dussek: Fortepiano Concertos
Concerto for Fortepiano, Two Flutes, Two Horns and Strings No. 5 in G Major: I. Allegro ma non tanto
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 0x6f66df3f5721d98130b0f223c20ba5aad82eb9f507f2b3ac181a7166017d8e8d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7141500296.
Concerto for Fortepiano, Two Flutes, Two Horns and Strings No. 5 in G Major: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62ca38666f1047b5f3711aec79e7978a6f342a29cadb35c70723af7161894db8. 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/ES7141500297.
Concerto for Fortepiano, Two Flutes, Two Horns and Strings No. 5 in G Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x194b82dbea57b81e41e7fd15011e31cd78635b8efa12bae043fc588a1dc1488e. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/ES7141500298.
Concerto for Fortepiano and Strings No. 3 in C Major, Op. 3: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd84ddb81698d762a3c05b4ad0639718704aba0d586c6f7f89017e1165971a5f. 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/ES7141500299.
Concerto for Fortepiano and Strings No. 3 in C Major, Op. 3: II. Grazioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f31bea92596c521f3a8e33eb803f846d015fc542eeb16d19cc9b6c45398157. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7141500300.
Concerto for Fortepiano and Strings No. 3 in C Major, Op. 3: III. Rondeau (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74184b7976623e04ea8b65c8fe37cdc3db773e02bc1fd2973bf27bbd5709fcd1. 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/ES7141500301.
Concerto for Fortepiano, Two Oboes, Two Horns and Strings in E-Flat Major, Op. 26: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1344645430ff5a1d41ddc045d918fcd21ab70dede90b1ea56ccfaba7ad80acbd. 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/ES7141500302.
Concerto for Fortepiano, Two Oboes, Two Horns and Strings in E-Flat Major, Op. 26: II. Larghetto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5208445f5d15c9284c71789f2c4f42d58b509b3d23069e05f3b227699e40ea90. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ES7141500303.
Concerto for Fortepiano, Two Oboes, Two Horns and Strings in E-Flat Major, Op. 26: III. Rondo (Allegretto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d4bd664dae96b5e97d287359938f405ff1340291002108813b761ae8eb6d4d. 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/ES7141500304.