Ben Zion Shenker (1925–2016) was a world-renowned American Hasidic composer and hazzan (cantor), associated with the Modzitz hasidic dynasty. Shenker was born in the heyday of the American hazzan. He
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 0x1b1cfe44754b11d0bcdd5e50b28d75938d62b185b0ab46e40a11d582a36ca30b. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa38ddea-3ad0-4e4e-a8b9-3a02805f1445.json and https://artists.proofprofile.net/proofs/artist/aa38ddea-3ad0-4e4e-a8b9-3a02805f1445.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x47161479597d4aecab4ed670fd05db52ec816ca355494ec1afa8fac3fd302020. 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/QMADN1454204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6a1b214b62406fb9bf587526946fe53e8ea33c36b955264b6c47d9dbe2982d. 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/QMADN1454208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2939f7a5ad808d7adcc46f3262f191066cfbefa71dc9a888fe69db84b1fa13c8. 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/QMADN1454209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7899a7b9595d558bf3abbdee4b4e522b022518f97986b1f6d89f71e3735e954c. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QMADN1454210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e7872dccf744cf0d4ef80cdb65dfffb69eb5f83d2886f62ad457f00ece9f8b. 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/QMADN1454217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf614f627c871eb9b6947e9e485285a019b0a1f94c2c40cb99dd786487e082f5e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMADN1454201.
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 0xd17b76dfaf3c52f8409245ea62105706db989210e54a67952f1407a0441d9f91. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QMADN1454202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ed7b9f788a5f69311389c08f8c69f50bb7df1409ea8d38c7462e9bcb1b98db4. 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/QMADN1454203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc31b9db78a9e5bbaff3ad27b91047b8e191cadddd86b4c4ef52228d4fa531c43. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QMADN1454205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6949eb42967bdcb88e634ae5377b46fcb234d1cbfa8fd6d074d19b02166ef2b. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/QMADN1454206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe61342623f5d80fb9552ead2685a3cac722524b6eba2a8f3201ac2698cb2a65c. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMADN1454207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112b1438f31e0d32e8c142934d125f9157d692e24a3414afce2a76f5e2e66573. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/QMADN1454211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179fa53e4a501cdb1798311621c9eed21091dff88eba393f85575f16cb9ff284. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QMADN1454212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35734b84a3d3a526b165476b47abee0de94d04accbf2ba52970c05344cd6eafa. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QMADN1454214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0e4add901da90bdf85d23a26759eedbc4f756b429762345b481710d5c4e8470. 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/QMADN1454215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e2b6a2f12a6227df7d2828dba9a298aa9669c73e38d1ea7dcdf0aceb846564. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QMADN1454218.
Itzhak Perlman - Selected Highlights from The Complete RCA and Columbia Album Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4410dc14bba9ed49792e4049cf86d7d282fadb7e80f382bcecd7e9342466803. 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/USSM11203842.