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 0xcad30f2932511876c718d2663dc606d4f00aaba276063ab97522efb805269905. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9ec0c818-186c-4f52-bea3-9c8fa99de1bd.json and https://artists.proofprofile.net/proofs/artist/9ec0c818-186c-4f52-bea3-9c8fa99de1bd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Symphony No. 2 in D Major, Op. 36: I. Adagio molto - Allegro con brio - Piano Trio Version Attributed to the Composer
Beethoven: The Second Symphony (Piano Trio Version Attributed to the Composer), Trio Op. 3 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 0x66305431cc8f30a3c294c586494732cdf1f23e72f834d0a2852139e785826c50. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ITLF52416529.
Symphony No. 2 in D Major, Op. 36: II. Larghetto - Piano Trio Version Attributed to the Composer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7b32ec07f82ef85041c54802b98144130a2253fdfcbec0f6b4f4890f084e73. 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/ITLF52416530.
Symphony No. 2 in D Major, Op. 36: IV. Allegro molto - Piano Trio Version Attributed to the Composer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025a3480282016837a85dff22e17415d61c09a24684d482c151adc5dcc9eac13. 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/ITLF52416532.
Piano Trio No. 1 in C Minor, Op. 3: III. Minuetto I. Quasi Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1e4d44b3fa470d2e4cdf61d08e2c14b02ff6786303132d5bb0712d58b57cb00. 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/ITLF52416535.
Piano Trio No. 1 in C Minor, Op. 3: IV. Finale. Prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x367fca19594df8d21b44d9e9e3a3eeb966b7870f82608f5ffa2ca1d14ae7ebef. 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/ITLF52416536.
Symphony No. 2 in D Major, Op. 36: III. Scherzo. Allegro - Piano Trio Version Attributed to the Composer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd191a7b8f8f8afcc4bddc56628c73375950d35fce858628216873813a3614a9. 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/ITLF52416531.
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
Piano Trio No. 1 in C Minor, Op. 3: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b66df3c120023c0a91a7d064228848a497a5a13783ee2ae6ef02825475a9b29. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/ITLF52416533.
Piano Trio No. 1 in C Minor, Op. 3: II. Andante cantabile con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1b27e97d0b18d4cd7cabf005a63c8510b3187c7bdc94a3ce30634e2afcf0bd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITLF52416534.