Jacob Narverud (born 1986, in Meriden, Kansas) is an American composer and conductor best known for his choral music. He is often ranked among the top-selling and most widely-performed choral composer
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 0xabbe872d406fcbca911081edd752d424b10de3058bab8059777b8002a12ea648. Chain 2 (Bitcoin): anchored in block 953808 (2026-06-15T16:45:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f51baa69-1505-44c6-9506-f31b801a817c.json and https://artists.proofprofile.net/proofs/artist/f51baa69-1505-44c6-9506-f31b801a817c.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 0xdfb61a506f4732f93ca482c310daade25efebb2ac41544c6a6606ef6987c51c8. 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/USMH92313359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9253ba78e5ec0bef05439f9f5693bf6166f3716a183bafc08bd1784c41bf5a71. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USCGH2238568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f061e4aecb7ee4245ed254b4449214cf5c71d8a058cf01e9e9175a85ebd770. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/USHM81916408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbddc737f37b292cb3b4e53b46f5302ee93aeea60099c76c80174c21302afb15b. 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/USCGH1970172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc04bf3311f067ec9298d2d6d25877f6ece56a6817f085b8b716f99e238d3e4. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:02:26Z), 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/USCGH2508827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c855c15e95054b67f6c959c5accc94934de633cd0aaeb7306b2d05122444e7f. 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/USL4Q2404159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75e941309703999001beee1144198ddfd3c617612a2918899c21715b1912415e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USCGH2418386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd9443a6886fd1f59eb215c54062652ce0d90011d807bde109e963c82fefa12e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USY282310446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b7325f1ddfd977cf50fad3392dbeb296b55d738f369145d51d898ddf7edf5b6. 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/USX9P2336157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb126331bb0bf4b2fd75efba13ed11dc7a077ac61758a588e8c3ae5a1f109c4. 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/USCGH2353486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc103809ac64d9d1950a6975e4ed9bc7717045efab6fbf8d43067bdd53009b4. 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/USL4R2256798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cd9577e49d47bc715db82f2174f8028c9bad7c8c3c68bd7d8437fd2f40ef490. 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/USDY42261657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68c134f6ec71de4f41f1fc2b203a2d9870643741f66053abe0f33176789ef758. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USCGJ2210149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e99385e859995ba280e5b94903d6f2f2a8d58bce8f057701c08148751547cf. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/USCGJ2051419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc056bc6faaad1320c9f78a195695c1d7d3e7359ada065b5d7cea9333644b3f7. 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/USCGJ1996262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe56c74c601e92ec1efbc2762d58c79505be9ad036c70389c88090d3d2afc9e1e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/USHM81936763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd86ca69f26039d04ab2edbab5001a629d66368a09eb3b8fc90ce335d1696ef3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/USCGH1946546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf5c231f415f4ec5154fa023261561a26ac307ecd4bd7e398c430502cf63a409. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/USCGH1980639.
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