Jon Cowherd is an American pianist, composer, arranger, and record producer. Cowherd is most well known for his partnership with jazz drummer Brian Blade, with whom he co-founded the Brian Blade Fell
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 0x04ee546d4702e12ee0c069b79ac1c215438099e76e5618cc4415a480906df3ae. 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/7e98651c-af7d-4581-9790-3807d1e916e9.json and https://artists.proofprofile.net/proofs/artist/7e98651c-af7d-4581-9790-3807d1e916e9.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 0xa58ee99b0beae785e728180862b922462f9fbaa9f328129dee6f5d1c19e5c789. 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/USLD91757069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9bcdcbe58f075086141c079e4403581a28203b7b45d99c875e668e96db74b8a. 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/USLD91757071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f3f2750cd92d82e522b7e6e4a904ed3ef668c8888bddc11be4e72f077c49b5. 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/USLD91757074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca92b38dbb945d7ea9d7af62dce4a25e3c9cf759c3bc759b4e4f6b00f5db8150. 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/USLD91757067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ea941be8c25051c75ec2152b31c18a83895a928b01cd69a930fc2888d73666. 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/USLD91757070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9144c9f1cf36eb8bac81b204c79a250a248685a7babbf83263a088f516706f3. 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/USLD91757078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7d7e73cd5ff945c84112ef716df41a383b0ba8c4c0c3300d9a02249a75a269d. 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/USLD91754916.
I'm Gonna Live Till I Die (feat. Nate Smith, Marcus Strickland, Adam Rogers & Alex Acuña)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0640f3dbd98d1e00b2f57a3cf68ceae4243bc840b176201af52eb6c41d6ee019. 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/USLD91736894.
Day Dream (feat. Nate Smith, Chris Potter & Adam Rogers)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c2bb43163402a35a43679feaae4db78dbfa95b4265d5baf7a11d7f14f006b6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USLD91736895.
Walk On By (feat. Marcus Gilmore, Chris Potter & Alex Acuña)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x912ed766015e0cc1e5003e64a1945a924c42f510c1deddef95605b7621be0b1e. 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/USLD91736896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a02e5025f94c8aaf5e33c30fe12f0d766849d95ec5d44b56f90715908a4135e. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/USLD91757068.
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 0xac18525e2bfddabea851f350fcf4a89551d74c971db4cd3af00f5a62a7e8f60b. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USLD91757073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72bced7b9dec254e529be68afc98ca19820e6b897ca646468a6cf7be59941583. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/USLD91757075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e34802381ac1985b649d21f3b2278f42230960533822c42056ae77cfeefd49. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USLD91757077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa294b7bcc26467a38fb316421717bbb2837a18869d13a8c7a0b6296866a1eb2d. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USLD91757072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe099fd40e832623414daad8ccbb50f5eaf86bab5501fc4aa19e8e1cb5ff0fb28. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USLD91757076.