El Tanbura is an Egyptian band, formed in the 1980s. Its performances are based on traditional Egyptian music, featuring the simsimiyya and tanbura instruments. History El Tanbura was formed in Port
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 0xb483645a863442ad956db3241b07fd175453c760f15ceab199143801bb839c67. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/69509f76-1436-421a-a011-9093386f888d.json and https://artists.proofprofile.net/proofs/artist/69509f76-1436-421a-a011-9093386f888d.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 0x94477ccb72382c6e977df8372f3b666a69303835d01be5a554c396577895c46d. 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/GBRXJ1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd3b55a4313d2146060f869b86ee7fdd0147a7f171e2b8ab7bc604a25b7705a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GBRXJ1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc44cf3964cd363e51d4188d6507318fefb784793acbba47afb1cd6ce2e6f90a6. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/GBRXJ1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefe94f155990ebc3b2bc9fad137f02b41de9f1d402051eb2a1220428223eb29. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/GBRXJ1300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8417323f2b1b56cba22366d6201d200209c17225cbcd6094877045cd92eb8c22. Chain 2 (Bitcoin): anchored in block 958587 (2026-07-18T17:06:26Z), 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/GBKPL0920687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0693d0062ff401754861ed5e209942bca3626f18133b78bb1948d4bc8c372632. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:58:34Z), 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/GBKPL0920691.