David Eugene Tudor (January 20, 1926 – August 13, 1996) was an American pianist and composer of experimental music. After playing the U.S. premiere of the Piano Sonata No. 2 by Pierre Boulez in 1950,
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 0xa17f4e093cd760ae0b40e5827bfaedd27a04b1977b060f1e6e60d1adc30addbd. Chain 2 (Bitcoin): anchored in block 954593 (2026-06-20T19:46:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bde2a824-872d-4426-b65a-bbeabe8cbb39.json and https://artists.proofprofile.net/proofs/artist/bde2a824-872d-4426-b65a-bbeabe8cbb39.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
David Tudor: Piano Avant-Garde (1956-60)
David Tudor: Rainforest (Versions 1 & 4)
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 0x3ef4e569f19bbc1ce94dd5fe8c214bd54fc925b6303647d1b20af474d49c9604. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/US4BP9806401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b3a864dd8cff3ebc1cc694f105caef2d787023c37ab6f87b46a4cf221006d4. 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/US4BP9806402.
David Tudor/John Cage: Rainforest II/Mureau
The Art of David Tudor (1963-1992), Vol. 1
The Art of David Tudor (1963-1992), Vol. 5
The Art of David Tudor (1963-1992), Vol. 7
The Art of David Tudor (1963-1992), Vol. 6
The Art of David Tudor (1963-1992), Vol. 4
The Art of David Tudor (1963-1992), Vol. 2
Music From The Tudorfest: San Francisco Tape Music Center, 1964
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeef3880c33fc141eabd4468e15125a3fb6ca83f4c9aa5c4d23ec175e8ac4c506. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US4QP1071209.