David Howard Lanz (born June 28, 1950, in Seattle, Washington) is an American pianist and composer. His album Cristofori's Dream topped the New Age Music Chart in 1988. Early years Lanz attributes h
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 0xc1471203f7d5fbb6b563e9f1b8a332447b4d02e2adec23365aef6023580a67d7. 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/f327abe0-64bc-40db-befd-a50e461a5b2a.json and https://artists.proofprofile.net/proofs/artist/f327abe0-64bc-40db-befd-a50e461a5b2a.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 0x4da227e8d8b972d36d3a0873cab362d612c7a53f7cb1666f9b3c9d017c25e048. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USNA18711642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x369ba514270e5b1bdcaa1c19cf75a16e2c6ac5f5a91472e4924cb403a0f2afc9. 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/USNA18711643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d192d5ddff647cc83cff43c80ec2d861ed5a9e75606a372bed5d25d8b8e8229. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USNA18711644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6258afc6f182b8d59ed9cc59977d544a50684cbe02df738b7498d5100bb2289a. 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/USNA18711645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84a886b96ea319731b66da62db335a678ab63cd19d76cdebc169ebd1798d904a. 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/USNA18711646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe452b67653717ba2899886bb3ea845f7662b3cf0adaa7c117215877871b23bce. 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/USNA18711647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1565e0f330db0597bfdac633c2ab152fb1778188eb58e7788d98510720eb7f0. 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/USNA18711648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d90688c22b4c78ab010a736a5d9c0d73a80f35a82df80845008606d776e1623. 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/USNA18711649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd6b5a89d2bc5f4e323179fcde8a5330a2209dfc01f1d55d1d8ad0d699734ba. 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/USNA18711650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94408d60035ee644a645ed676a0b5b77d9ccb9020023e37d6ae1ec6ae4f54af. 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/USNA18711651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc58fce5d1a21450d6cdbc55cbfdf9e9334af841965bd45812985ce16685abfc. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/USNA19810625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec5377248b0787e119e4b67a8f235ad52e3c59dd7b645606c4c8b644d7e9902. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USNA18513165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc58fce5d1a21450d6cdbc55cbfdf9e9334af841965bd45812985ce16685abfc. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/USNA19810625.
Narada Decade (The Anniversary Collection)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578fb7335cbc7f3c5f614b0aaab2eaaddc2a1d9129090057ab5f806182812d7d. 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/USNA19311182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9edf50d3460192e93439419bc139fde0c34f37a90fed80e7955b3cafb6fbd15. 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/USNA19311190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125cbf869698cc2c370301d861225d16e252d80065890ed7f522417a6ce4e28a. 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/USNA19311194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfec9b6b6eb6453ebd80a93473f5f009930e763b3f57eb1b2dccb7c671c6af59a. 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/USNA19312002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a308933bc28709173c107ba818ba1960375b68bfe17465bf1502a1fd323a1b7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USNA19312009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24ef818cce75892180b8ce4c2b503afc295612c84586e7f08d2d75801c68567. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USNA10420528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x021d337d0c8dccc9c90788535bfffcc713cecf570e63cbad49f8392b0d765239. 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/USNA10420529.