Jack DeJohnette (August 9, 1942 – October 26, 2025) was an American jazz drummer, pianist and composer. Known for his extensive work as leader and sideman for musicians including Charles Lloyd, Freddi
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 0xab4c40001f81db4d7c4e4c72033f1f08eb6d3e2a84d47945c68b58c53773adee. 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/6fa52fc3-a37c-4902-914d-5ce9f3ce77b7.json and https://artists.proofprofile.net/proofs/artist/6fa52fc3-a37c-4902-914d-5ce9f3ce77b7.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 0x74288134b55e9d698caea69e5e9050f96f705cd47fc9c921f748d025b34d389f. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/DEB337914201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x872ad2a720766c5de8bc254d291c009b4ff4075b80411fa62d52cb0818866aa7. 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/DEB337914205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f95ebadcb2d3439eab915b4cbbef020d2456f4a77ea73f2f17686a469d925cc. 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/DEB337914202.
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 0x8b23d06c2b9b52ccac3a5a768173158c0bf851d5ff39a642d06b8f02526c3cb1. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEB337914203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1c8b71973e9bc9aee54f05583324f6318a902fa81c7c0d9173ac6574f92308. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEB337914204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa735a2e3889139f5636e10d0a8386adf40a09e1e859d461322ff27ef41e335. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QMLD61404268.
Some Other Time: The Lost Session From The Black Forest
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72e08ff215b7d7df8f033d3d9dea37242db11a36a501990239b99ee868a67778. 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/USA2P1622361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9392fbdf84bd618409e9aa2c059f09e5ed6d022876e8925a061f5e4c1413f60. 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/USA2P1622354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb954fddcd1944aab6f0c447095d3ec97e74d0908b218860b1d93d0a75c824679. 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/USA2P1622367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bf25bc70e098cef439e196ac519f86c4040a3605adbbe1b8a5e22cc7eb09498. 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/QMLD61404266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0adae2e593a8a60b76b81303acbabd0a7c341354a5073f429cd97620d41be750. 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/QMLD61404269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59035f17fdbe7f1acbdce12f023de8cf78e732d6528301e160be7e9ecc5f931e. 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/USA2P1622356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e801e0d2a794fa3ac886ba233eeb9cf042a81bbba8fc98034b162364b39d5f4. 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/USA2P1622357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c4537dae53c5520aa7b4643c38876b08bb0c1274393ae867bb62fd49ff5664b. 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/USA2P1622355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e50ad008d9177767258e64d719b1e32c8053de0874c5b184418d42717453a5c. 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/USA2P1622362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa00cfc5b6593750b6fd8f2dc26ab37f35ed6c69d7589ca4a01996f5a3f38f3. 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/USA2P1622364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe14c0a3613d735b9abda70ec169c25db779d3d8d6855398e33e3e18cf95e3781. 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/QMLD61404263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6a0abf047ebccab42bd9f361e4882c6547054964c1e8d73ce2ae0bce48c6767. 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/QMLD61404264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3021746845b8a3a08dfe4ae7a7a05ff943bbb7d23a6938128cca2e3dc397ba7b. 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/USA2P1622358.