Zach Sherwin (born July 1, 1980) is an American comedian, rapper, writer, and actor best known for writing for and performing in the Epic Rap Battles of History YouTube series, as well as writing for
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 0xdb94f13a39197807b3cec14216114910e77f5841569b0c8e7f0548fb8eab687c. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af98a884-11c7-4b7a-b21f-88669aef661b.json and https://artists.proofprofile.net/proofs/artist/af98a884-11c7-4b7a-b21f-88669aef661b.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 0x51d7da1b9fd434431b858e233701e97ca6efe5cfc67340fde8cc18fbe3ccaed8. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T12:57:04Z), 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/QM7VB1600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3027bbe33f5076743435f8740a0b47a03979efbbca02bcd1e4ebddbc34d7503. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QM7VB1600020.
Crazy Ex-Girlfriend: Season 1 (Original Television Soundtrack, Vol. 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c4ee3f9b4f092d3d0e5dc27125dd3425f0dfa1d342d56a03e734f74e28d0056. 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/USNLR1600259.