Derek Gripper (born November 14, 1977) is a South African classical guitarist. He is known for transcribing West African music made for the 21-string kora to the six-string guitar, with a focus on the
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 0x678a99615df3c92980586c3afaac9abb6b5bcd671c10c148a04e3b5d294055f4. 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/b83d0348-5d64-479d-98f7-910233cfff26.json and https://artists.proofprofile.net/proofs/artist/b83d0348-5d64-479d-98f7-910233cfff26.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
One Night on Earth: Music from the Strings of Mali
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 0x6c769204dc04cde35325728a55e08d955f35ef29e68287bc1ee2d4721d784bdc. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/TCABK1275245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1406abbf19146c503dab6f6ca2ece8fc38605f67aac704fea350b42e895727da. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/TCABK1275247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389b3e02d3129b7dc8915930b19199abb84604e1c6108d895e73e159793cbc67. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T23:51:16Z), 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/TCABK1275296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa448c35bb5bcf5cab85d985a0e8ef176052294cea66a981463c7d9717899917f. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCABK1279657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c32643a78425eaf673ceb97f94357d56558b5e8686acff096a57811501d3c9. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/TCABK1279659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929b0816dfdb62063eac50b3d70b5627a3e940e345fd52277162eddda3309107. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCABK1279685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7adfd1e7810d2778ddef154a2135fe70d5b2f81745e7927d1592054c18befa53. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/TCABK1279672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f90a8fe1bb3925a96b541bdcbdff138de5d0e01811fc683d278bde3954d395. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/TCABK1279675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399d87a9fa111b597a126d12bc921d10915e51ebc46aa2bec066b4062bb33b23. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/DEG851501771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47c53d7a8f74fa1f9f3ed49619775bd54312ca38cab2b23b6419966d4109ae0. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DEG851501772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d381ed7c0fbac301accb7645da9011918d2e4084f983a4e1d126729295dfe8. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/DEG851501774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e3c800abdf05685b32c9cd4dd60861015c45657925e8bb8e67a526aa44629f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DEG851501775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e69bccc6c302d91ea2645126f520a00557c390cfab665781ae0199c33eadc9. Chain 2 (Bitcoin): anchored in block 958798 (2026-07-20T02:55:00Z), 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/US23A1512308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61f6159f76f27e2aeef3f4da76c2ad49385d80d09522942f281ee457bb53c6fa. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/US23A1512310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a77421e83940973fdae64fc3abf2b4044fbbc6ec8b5acf4ce0e1adaf2068f57. 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/US23A1512311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc6bd9c9ffbb1c6dc7a791f87735aaf7bc81977eefbe01996ac9fff16449ed0. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T03:04:10Z), 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/US23A1512312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa183d076ea6f82a644fbf7d0456ddf67de1704fcfadc5231ad37823d0ebb2d7a. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/US23A1512313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88e1ae9f82432a546c3e4b2d9975c73156bd782816ac352de9d23fbd268a554. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-20T00:19:40Z), 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/US23A1512314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc2a854919873f0d15fbad5d1d223be663e4d3dceff974abacf2ccd684e6ca77. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/US23A1512315.
The First Two Minutes - Cello and Guitar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5e3663002ec9ebb166c01b5ca3cc38d1b33ddd4975c94310331753c54f7d17. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/US23A1512316.
Blue Light For Julian Bream (Mono 1/4 Inch Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4868f198cfa1bd2222d314c9b8355866904d1b59312dc72912dbb40ff1b12c5c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US23A1540220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6573c7694e70f79ef3e18f05f17696489a5ac3954119a9b0923195f420798de. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:25:32Z), 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/US23A1550840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e0739861b7976ec060745fa90a18970b71a43d5041272d0f5f31da3875ee50. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/US23A1550833.
'56 Live in Cape Town (Duo Version Live in Concert)
Musica Do Cantinho (feat. Derek Gripper)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5081b9f1d3a7454479466b85fdcaedf17d752915df6bb358700b5e893bc86c. 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/ZAL861400018.