David Perry Hazeltine (born October 27, 1958) is an American jazz pianist, composer, arranger, and educator. Early life Hazeltine was born in Milwaukee, Wisconsin, on October 27, 1958. He began study
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 0x1bd212c80e39be68f740e26ad8a4fa656287c8af9ba1aee4e42cf88c3778038e. 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/e15c9c1b-8714-4cb1-8b4a-8771be9a35a1.json and https://artists.proofprofile.net/proofs/artist/e15c9c1b-8714-4cb1-8b4a-8771be9a35a1.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 0xfae06d393491b0a4dde7451ab6525efbbe10d2ec3b88eed99a12f67107eccafb. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USDFN1210013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a8615542fa8cea7301ba240e0f75a80de7520948ed0ec7c95c79c822204558. 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/US99C0536001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff41aecb67e10a131f4c51239e7629ddcd6ba9453c6f08d5eaa9805fade1a992. 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/US99C0536002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65eb7981714f40811123b15452186a6923a29a4c093d2b30dd5e32de8b723c14. 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/US99C0536003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1ff6c708a038de06f964f1c595c28021d548dfa7b4d46dc211eb5d1b3fed72. 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/US99C0536004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05410a212abf65d882d30f0ccea2c55af5bc3577d24f9f5ade36a34a4553613. 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/US99C0536005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc337fcaa7cca913170a3023d6689bdbaf7b63978631b4365ea7aed35f73a110. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US99C0536006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e9452a8969fcfbd3e87cba07787b998f5c7585681f9cf1bdbf49cfc66bd98ef. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/US99C0536007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fdff0d242b9b02b31ad05c9b962b77d709e3da1bb7c9b38a6655e31b07f10f6. 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/US99C0536008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365b674540c5d878e3503cd8e339ee1451b76f84265a322fd8af7241878a5154. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USA560613191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2434ffbb7f2ecf5ada7d6758a770827728501bd653f37784d7dcf77bef69ea66. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/CZM331305103.