Sam Franko (January 20, 1857 – May 6, 1937) was an American violinist and conductor. He was the brother of violinist, conductor and concert promoter Nahan Franko. A native of New Orleans, Franko stu
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 0x7c944da8c516f1ffec20c52cec3fa74fdb501261904a271b49bb820fd2e49d18. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9060bb6-8a49-4044-8d30-63ac55238480.json and https://artists.proofprofile.net/proofs/artist/e9060bb6-8a49-4044-8d30-63ac55238480.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Violin Concerto No. 3 in G Major, K. 216: I. Allegro
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 0xebf74065e47fc1f69709df903fb29051e6945712cd929ec9c3fb497bed636cd1. 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/DEF057800352.
Violin Concerto No. 3 in G Major, K. 216: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe5b665c4fbe98646a3872098ad27ba68e85bb11e4f65323017c67da91a0a4be. 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/DEF057800351.
Violin Concerto No. 3 in G Major, K. 216: III. Rondeau. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x062203ea4a9d823459c998cbc42a78b244e9880220d4946f9882f28d8ad02395. 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/DEF057800353.
Mozart: The Violin Concertos; Sinfonia Concertante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd199564d3c37f5785881cccb6cdeca6f708d7c7ffa28ee77b655429c44943732. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960500111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0174f4763db5ec3f7e395e9f449c60fc35bcbdbacd6e01361cde7df804b9709b. 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/DEN960500112.
Violin Concerto No. 3 in G Major, K. 216: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8645d8c4183d6f27b1837920b67ef4a0a5f72cec54c9e67de8344abfd1f843c4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLA507000245.
Violin Concerto No. 3 in G Major, K. 216: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0bd2b9769a78eea11cbe6a8cb7a15d4b14406d4da6ca57c7f8c5449a2f9129. 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/NLA507000246.
Mozart at Midnight - A Soothing Little Night Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e0bd2b9769a78eea11cbe6a8cb7a15d4b14406d4da6ca57c7f8c5449a2f9129. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507000246.
Mozart: Complete Works for Violin and Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8645d8c4183d6f27b1837920b67ef4a0a5f72cec54c9e67de8344abfd1f843c4. 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/NLA507000245.
Violin Concerto No. 3 in G Major, K. 216: I. Allegro (Cadenza Sam Franko)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d1ad1e4a3d2b4771ff2b0d2cedbc7e8ba19b6197156392088d971f93d35f89. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058200331.
Mozart: Violin Concerto Nos.3 K.216 & 5 K.219
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebf74065e47fc1f69709df903fb29051e6945712cd929ec9c3fb497bed636cd1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057800352.