David Handler (born July 24, 1980) is an American composer, violinist/violist and entrepreneur. His acoustic and electronic compositions have been described by The New York Times as “eerie” and “super
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 0x2938dd75c7cf30aeda40370fadc644834b72e3ef78288d7a6a429f38e5eb3dee. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/78d24b82-4f22-4c39-bfb9-055471ff98ed.json and https://artists.proofprofile.net/proofs/artist/78d24b82-4f22-4c39-bfb9-055471ff98ed.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Life Like Violence circa 2003, or: Untitled Caprice
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 0xe7f4726bb2e15df0685e903e782acc1244b3364ac4a9207634ba43339154978b. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-20T01:41:48Z), 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/US3Q52510302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d6da5bb5219944d7b4972a06d973176f33186a129ade6b5277586058224c8c. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T12:01:14Z), 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/US3Q52510300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f4726bb2e15df0685e903e782acc1244b3364ac4a9207634ba43339154978b. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T09:45:48Z), 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/US3Q52510302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661cce2017e32bd578f5405285a7846aacf99b6a1c329926f9c2ef1a6a901927. Chain 2 (Bitcoin): anchored in block 956862 (2026-07-06T02:10:22Z), 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/US3Q52510303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf203f246d4b51837718063b3d16d5f9e3912118e671e374052b7409d3c7343a. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/US3Q52510304.