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 0x01e3579962a233f95d9b1c3f377b6db949404bfca08c6370e0dad19b33b128c7. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa7cce3d-f9bc-4d1a-86da-428564aa4c29.json and https://artists.proofprofile.net/proofs/artist/fa7cce3d-f9bc-4d1a-86da-428564aa4c29.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hoffmeister: Viola Concerto in D Major: I. Allegro (Cadenza by Beyer)
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 0x9f4f64d97a528a5e47e42ea6f7f74b6a8ae7c3727db6d63ea9cf8b91dfb6937e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110601738.
Hoffmeister: Viola Concerto in D Major: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c0598e6d47637930face1050c1204ff6e3749ab3e114962fe469002ccc6ca1. 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/FRZ110601739.
Hoffmeister: Viola Concerto in D Major: III. Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x709b12ad861d09473a2793fa9f243145d7a36983ad5460d82ca395c2d50138c3. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FRZ110601740.
Hummel: Fantasy for viola and orchestra (reconstruction Fernand Oubradous)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff03fd9bcb81b7cc2da146c48050a27b85c3ef0524deb76fd2e677d9a4b0dc65. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRZ110601741.
Schubert, J / Rev. Schultz-Hauser: Viola Concerto in C Major: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2e22e5c77b295ec089e86cb00b86d43adf4dcad8e287bcd7c7ba97a84846e9e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110601742.
Schubert, J / Rev. Schultz-Hauser: Viola Concerto in C Major: II Romanze. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0335919fe20de47c7cf705808fc3c30eb12dbae773d12e53cbf363af7a3e02. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/FRZ110601743.
Schubert, J / Rev. Schultz-Hauser: Viola Concerto in C Major: III. Rondo. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c873904181ec3f862cf33dd66d91b0c5895e950edf8fc055672951c4a639400. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/FRZ110601744.
Weber: Andante e rondo ongarese, Op. 35: I. Andante (revised Georg Schünemann)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a98d9fb9ebb838722e097efc8b7f9f04bfdfff22030398a7debeb1822979e0. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/FRZ110601745.
Weber: Andante e rondo ongarese, Op. 35: II. Rondo ungarese (revised Georg Schünemann)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdfbcecff02bad4dac476c7215ac5db26fc7357b1cabe27b40f7614f24a8b15f. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ110601746.