Isaiah Katumwa is a Ugandan jazz musician and saxophonist. He presents a weekly program on NTV Uganda, called "Jazz with Isaiah". He is credited for turning many people in Uganda into jazz enthusiast
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 0xeb82b66b3760664ac1f6e31194bd1448509a405c54b787468fd56798d237f503. 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/b1fbaf53-dd4b-4f10-aa41-cd5fd7cf68f2.json and https://artists.proofprofile.net/proofs/artist/b1fbaf53-dd4b-4f10-aa41-cd5fd7cf68f2.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 0xff34ae27ea03cf0ade8e0e8cd54ebb0949ede4de75ff946fe50ee28cb9b1bbe5. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USCGJ1617978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51a469068a5530cccdeb431ad5591645f398e6dc5cdcbef960d9df22b9a03cd. 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/USCGJ1617979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6220938da3a366eb940193ffd410b9399809333476277481b439b6dfffd23792. 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/USCGJ1617982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x438e886929019df286ec40ae1236502ceedb06361886a231c92918056e536776. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USCGJ1617983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60d541bc2506b0e592dfa0e0ffbdef9bf213811fc4b8073409af2564fbd2e1f. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T13:52:01Z), 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/USCGJ1617984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e289eb255014b4615bea0042c4eb5a271a9be8cbc17b45b57341d3a5d0691e0. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USCGJ1617986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd43409ecfb62a89f33f86b3e76d90df764b00db08d8ce0bc1ca3e11b6505bac. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QMAAK2033183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde069f9535437eade8708b9e3b35bdda9e4f29dca5175d9d7e1a8ddbad0ae418. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QMAAK1918216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0150d3e83c6b100167967331305ebfd132e7e633495d7770788d0318f9ebda89. 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/QZRCY2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b8150a1f823d5097e64e3892c7e3ff8e3c34d182f70bb3d100d286fd25a0d52. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZRCY2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb88e9be9092e3a374b2fe9938c190cb1dcd46c8cc020010eb48801927b2887. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZHN32559905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66925dda9c0a68736757d2b887f85890b68802ad9b73997c631aa0c4a523776b. 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/QZHN32559906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda686f3991a4793fbd64215c7f250b7898c48e8bef91aa5e90fcbfab538933e3. 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/QZHN32559907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25c56800d85bbc6c26398670f93cfd50195404e3466e0fd54d93e7ad39f6e53. 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/QZHN32559908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22e540272df7c46957ffa031c3664cc474b7a44ce8a11882d17c6cc1e1f3096. 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/USDY41866541.