Mark Moshe Kasher (born July 6, 1979) is an American stand-up comedian, writer and actor based in the Los Angeles area. He is the author of the 2012 memoir Kasher in the Rye: The True Tale of a White
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 0xa1b2ca90843328cfffb4ed1d84e8a6d79f1d987db9d370fb646f88e88053b1a0. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34fa65ac-36cc-41f8-aeb6-bd114a97458d.json and https://artists.proofprofile.net/proofs/artist/34fa65ac-36cc-41f8-aeb6-bd114a97458d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Everyone You Know is Going to Die, and Then You Are!
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 0xb1160da4ae5167a934526363a0002a9f6ce523b17e6a1229038cbb28e6ad971f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:44:24Z), 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/USLQZ0800491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a12a2827a1459b6e8de900a1b515f472b4931164d0e3fc30f99fa9befbecb6. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USLQZ0800492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc21a84d7442265a71eff90ce78cae51250706eeaf2c4d199fe179fbc7f13c005. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USLQZ0800493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb67ac90fbe3848e2f7afd32b9e78e051576d6b2be935b5294b0007806e10f7b2. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/USLQZ0800497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e128aa048515db09e13bc90579ba4cf3c7b6bb7991859589f993aa0ea9c5cfb. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USLQZ0800499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b590f7799dc4830d4c27e86c16011bb496f6fbb899e3480b7753f472685b449. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USLQZ0800500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b230876077c2b86282f192ebf89c5ff3348574e0b6cacba400ad7436ddd92c4. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/USLQZ0800505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca6cde8c857613564b791818ec21582e51e6038d02eb0420b95571f464fc2b3. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:35:07Z), 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/USLQZ0800507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1b96b5294716d997ed173f8cedd70a98a91f69cad951bafe0dbb8e3829f2602. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USLQZ0800508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67062c7006c6387b5de64b1bb6ce74ab3cf02aa13650f63c6d53b4dfb3b28ea7. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USLQZ0800510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fdff9c88b036c1a90dbd76c65f1e7b940c316c2f40e2c34d3932ab30c74792. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QMJYX1330303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6c4482c04fb1b606031954fa98b03fa796a4e1b3125c66612b969fff947a41c. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QMJYX2073204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ca04c91c5881726cc102a4612faa550a5eb50954082f479d50ad227c419c23. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/QMJYX2073206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ca25465dafa81c2a12d44a70c8e398222337f4fea58267341652b4ff00012ee. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-20T01:48:33Z), 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/QMJYX2073211.