Kahil El'Zabar (born Clifton Blackburn; November 11, 1953) is an American jazz multi-instrumentalist (mainly a percussionist) and composer. He regularly records for Delmark Records. Life and work El'
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 0xf94fd0fc95a9d1dd1e46fba58463639df34e0a6b4adc5777d6ff2365d61a4d7e. 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/3a85c130-92e9-459b-b7a6-6e1101ebd114.json and https://artists.proofprofile.net/proofs/artist/3a85c130-92e9-459b-b7a6-6e1101ebd114.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 0x41542cfe1595a6e082ef63d79e1bce1182c414c10f7083c904cf6198ff3a7ba6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/UKSJS2000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc6f2bf5c969d016dcccc96b18124ac0156c5445b965dd7a37501ac452f0409f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/UKSJS2000019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eb1c5a60c9bf0c05531f44ba3f8f1f079299b2b08d436aac9b266e21f053132. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/UKSJS2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40dbc5bae13e31169337388c1819a0d15862df695f9717646bb88fc56111264b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/UKSJS2000026.
神游：黄金海二重奏在深圳 Spirit Groove: Golden Sea Duo in Shenzhen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963ad14bdd2f45ce6483457f578970a91b803fd28f6a0f59c596b92087d8fd57. 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/QZNWS2580465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc730f934a6616ece6d0f4ec681555770d8196200c767abe8c73bc6a223d04882. 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/QZNWS2580466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e07d3933b96502db6091b83a719421a0a181f848fd52079edee455eb6bb837. 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/QZNWS2580467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7300eac04df1497f2aef576922df7f04823062e94678246161e075b274e42d6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNWS2580468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec42dd3093e2a741ee41700eec8e59fedbf4b1dcfcee1814814daa30c237afa. 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/QZNWS2580469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb208a8550ee19fae46d0048e37bc8790c5a2a2ac15a0f70d92fce6ebd2e4dde7. 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/QZNWS2580470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e120cbcd1e7255141c95500611864a2e3ce0d76fde9e6efa7c9c1a2dd060493. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/UKSJS2500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845e3f8fbfe05c1722f52e10c0ae12a43cbdc57c556d1f6b5696f2254d576cb6. 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/US4B90449603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bccf0eb9a02c0e0b6367e58175ce785320586d446908651265bfb529cf9e04. 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/US4B90449607.