Arkadi Duchin (, ; born 1 June 1963) is an Israeli singer-songwriter and musical producer. Music career Duchin sang in the rock band HaChaverim Shel Natasha (The Friends of Natasha). The band, which
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 0xb5a0765dd84e54d6a176825bef39721626c23cdb2df37a5c8cb9c4ed9c4844f6. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23993333-9a8e-452d-a266-6ab8d60eff70.json and https://artists.proofprofile.net/proofs/artist/23993333-9a8e-452d-a266-6ab8d60eff70.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
ארקדי דוכין והפילהרמונית הישראלית (Live)
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 0xcdfc4517a9db7cefdae41d2e8e79fd4fea408352fd98d0d558eed9edb1443460. 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/IL4070900359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859fcd2461bac6c788325180da10abd158e2b5ab5e1093271721599e737ab193. 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/IL5842444817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x938a7a4b04c40929d9e74cca5b51b3b81e25d084b467dd42c67d84b996208de6. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/IL5842444818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90bdf1c5a478fd55ccb133ecb45291d80a346aea9cd3b587ab968da0c56ee6f8. 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/IL5842444821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1f08575699fe00640abe584d1738a88d92d032c81fd09b0bf575604259c7986. 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/IL5842444822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1675fa2a0128d832319af38a717086f071678d19c94a37ed5849559f71f7b911. 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/IL5842444824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43d247bb34aadcfde2d18d9d4cbee6f86a41d5e9639daba78dffcea4049cc324. 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/IL5842444826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06cdecd9ca0ce82e5e278e50a8773da2dd9ff92da8c5ca378cd421ba4855473f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/IL5842444814.
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 0x314fd71df7ded2288de3c93b81f93686e140cfeb4dd8751f882bba0453541b83. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/IL5842444815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4345b186a22806df62211f2a303d3335cf03cd76ad53486a72ebeaaa9976e049. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/IL5842444819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e1dc2534e32256bb3d254791216f2edc297cbfad8b47ef8b470d4393eea83a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/IL5842444820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7877a508dfe79bb7e870606113beee6c1524659e7dfecd3dbb7142481a940024. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/IL5842444823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a422a7ad09d2d949451071cc9acf5c45152053170744d1949b78f2a8326def2. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/IL5842444825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe58d8470c507da7e419517b9c13157fd36b17f263068931ab7a98ddb09cde39. 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/IL7532313701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a468fc194e2642d8667a5d71335cb57c8dba5e7f634f2df1a071721814347b3. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/IL2952308001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf286eac5907a4cd5256a8781c8d74ee502903de5420eed53ca4fa2ed766ff431. 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/IL1041001311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb25db671ac10f09d1f9366a2344ec77818ad8d45fd62b6960978efbdfa40a1. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/IL1041001308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10e3342263c016ffdcd2fedde4a02ff17a901ba25596f595e442a4c6ee5fced3. 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/IL1011122771.
עבודה עברית - מחווה ל-50 שנות יצירה מקורית
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8c30dcc05e0e8c24bb2e96078c379b81ce46dd76e857a2591fe54ad5e7ef27a. 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/IL1049801172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4a8f0171218323dec7ef9f53169753322714108cb122929f23401f2e59e6878. 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/IL1042006404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30813b3db0b71dd41cd24d736ed95e8d2fba17bb6130be6d8430c1330245f42c. 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/IL1041001309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c3b6d00a13138832cd5afa1f8107826ba55105ff0ea17a57a2f58bec93b95b. 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/IL7532213161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaae1e08ac4cacc00a49da3c2d5de11949fdada64d9f92833fe83a4ac681373d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:44:33Z), 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/IL1041001310.