Stuart Zagnit (sometimes credited as Stan Hart) is an American voice, film and television actor. He has worked in Broadway, off-Broadway, regional and national tours, television, films, commercials, a
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 0x5390e80985883a0f633b077c997b21be4a1651081a006b482087e4a4dc0b487a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c136a034-5d86-41f9-a0be-c5286455fd65.json and https://artists.proofprofile.net/proofs/artist/c136a034-5d86-41f9-a0be-c5286455fd65.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Caroline, Or Change (The New Broadway Cast Recording)
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 0xc4ec51303a6010a40fab4384033a464432e359e58dd04baa986b4103f8651b9f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMQYB2124537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ca99d70e50ef380b5981acfd7c885f3fc883c6e57b1f4fc4ee797a25acebef. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QMQYB2124545.
Gold & Goldberg - Original Broadway Cast/2000
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8ad7530203c9862b3933e46da8416673ce13bc06d337d3838c84b5537c8052. 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/USUMC0000128.
Dr. Seuss' How the Grinch Stole Christmas Ensemble
Dr. Seuss' How The Grinch Stole Christmas! The Musical
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b36ec5ffa01033672e7db96877eab85d2894440f9de95a37cf4aecd01a512df. 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/USQX91302262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59d0f7a5b529cd7048c8ff6bc9904bdcea700701a8d4e61dcc17df6285e0f13f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QMQYB2124509.
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 0x51ebf2d6b4608b2b56ed7f983e03124034d66ad0abf6e906382e2a79df18f00c. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/QMQYB2124511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe660aa82857804ee8d2f8a1bff225f625ba4754d49d6803550298fa883cfe284. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/QMQYB2124520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8d34805217ffe7cdf6ac3337cb47fc83b7da50da111df2e10c43dae374c62a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QMQYB2124539.
The Movin' Uptown Blues - Original Broadway Cast/2000
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a1c393f971360ab9065b29f7cc4d5049196502fe5e0f7e3726b21aa4916718a. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/USUMC0000139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3007bc1d8f1acbe482a6a3bd5fa5afe78060d8847f599f55c8b08d27ac18ed3d. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/USQX91302258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa4394312524421f114402fae0d1c271f4ecf7a78a4012ad4ea7bf7f88e8f1ad. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USQX91302266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ca3f7ad545d4cefaa2ed8007ed424c70acadfa470d75d2277da9c18a01bb876. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/USQX91302277.