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 0xda4554a63ec4b6755ea7956b79f76fa258d56de7b8623577bebcf612b2a69a78. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0ff76496-1a27-4334-aeb4-8e57037e7b31.json and https://artists.proofprofile.net/proofs/artist/0ff76496-1a27-4334-aeb4-8e57037e7b31.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Concerto No. 3 in D Major, K. 40: I. Allegro maestoso (After Honauer's Op. 2 No. 1)
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 0x5160228e2d855b492cc8a02bc13085ccef3d65df93c2ce94595b6c6ebdbd3c8d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEAEV1694010.
Haydn, F.J.: Philemon Und Baucis [Opera]
C. P. E. Bach & Mozart: Double Concerto and Symphonies
Mozart: 3 Salzburg Symphonies Nos. 21, 27 & 34
Divertimento (Cassation) a 5 in G Major, Hob. II:2: I. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaea0075053b53c6b3bc7094951180ee6212a404ce01f318e323daca9c6fd3a8f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEAES1006010.
Divertimento (Cassation) a 5 in G Major, Hob. II:2: II. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c31a359f27496cb7ba39d054db17377ec645c1cb625e5783c167ae5050b40a. 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/SEAES1006020.
Divertimento (Cassation) a 5 in G Major, Hob. II:2: V. Menuett II - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c43a129d5c38883364cad1cd8e9ff52742c3ac4202f99bd444dd8ab93dc7b5. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/SEAES1006050.
Divertimento (Cassation) a 5 in G Major, Hob. II:2: VI. Finale. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a8b0138d2a9a0607ad3bdae366935a6bb9547c9bfafdc39eac5883c964554d. 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/SEAES1006060.
Divertimento (Cassation) a 5 in G Major, Hob. II:2: III. Menuett I - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86b7399614532a7f2dd27063ffede5ca6238e52aa0be955670db8848c4d39363. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/SEAES1006030.
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
Divertimento (Cassation) a 5 in G Major, Hob. II:2: IV. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40abccbfaa63d2186436432cb23ee2534432c59ae0d0e6c48aa5a27bac9810d. 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/SEAES1006040.
Haydn, J.: Music for Prince Esterhazy and the King of Naples - Scherzandi / Divertimenti / Concertos for 2 Lire Organizzate