David "Dudu" Fisher (; born 18 November 1951) is an Israeli cantor and performer, best known for his Broadway performance as Jean Valjean in the musical Les Misérables. Biography The son of a Holocau
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 0x594913e8c389acd9369459b757b718eec9cd01da2651a6b786c492aead97a372. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/785cfa9e-300f-42dd-bb90-927fffed97a2.json and https://artists.proofprofile.net/proofs/artist/785cfa9e-300f-42dd-bb90-927fffed97a2.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 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 0xeaf2c06aad267bce3e2e54e68b310b8bc792a4fe2d11685a3f681073968ca099. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHM20945315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49225cc9b7164a257bb0e43c4a410a865de322ee3595ab23800461528e063546. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/USCGJ0966197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdee08ad8404e4e5cee219dfcc48a56cdf63ddbaf4a697f314e25a8e0cd5c1bad. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USCGJ0966201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3856380524e45efafb897d07b2b7f07216f596d94a5acb7b9185f1be74455f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USCGJ0928349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38783b2632275807d0061bbfe89f30e136a27fa9f7f740c1cec8cf9723b15f34. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USCGJ0928351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0544d975c7c4ed7192055b6e35d7175be62349c3e7419559af2e11a844eb49e0. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USHM20967060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb3960b3aecdfcd2cd75c968adb03cb7024e4cb8606d22b1ea0e1938927c878. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/USHM20967072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5ab1b76024a4de65563142e33a569046d9904ee642c162cd7d838a1adb6811. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USHM20967073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1400222680aaf81bb9458c5ddea685b8ce4f09952b11611be92c794e18aa8bc5. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/IL4191003000.
L'tav U'lchayin V'lishlom - For Good, For Life & For Peace
עבודה עברית - מחווה ל-50 שנות יצירה מקורית
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f81b144d2a83ac6dcdd2bce1ffce84c23985f8c5fcfe6c2f839e45cab5460f. 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/IL1049801179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8110870d100f59baa57e56c65fc27bc217ee4e42e216d63a90c0a71b16120462. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/FR10S1906615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3051e7ce96f73ab9d57de3661d0c048d24c8f95633016509521fbdddaf5e6e0. 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/FR10S1906622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf831f3a266da7416e7b64e3ecbf42d9222ca317a7e9642c3ba8fdfab5898e6eb. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FR10S1906625.