Mark Linn-Baker (born Mark Linn Baker; June 17, 1954) is an American actor and director who played Benjy Stone in the film My Favorite Year and Larry Appleton in the television sitcom Perfect Stranger
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 0x2806f28e7c851c328edcbfc52f0eb2a97b3ac5b291eb40448828fc6fbf8a11c9. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/198e6b13-65cf-448e-83e6-e99272a478b1.json and https://artists.proofprofile.net/proofs/artist/198e6b13-65cf-448e-83e6-e99272a478b1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
On the Twentieth Century (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 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 0x75126a4c4f0b1d5dca7bf2ad2b989eb10003080d1cbd69cd9f77633ea998a96c. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USB961553202.
Saddle up the Horse / On the Twentieth Century
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66949bf3b3ad60a62e9af41b0f118ed8a087630a2f8df33690eefc429b7699b5. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/USB961553203.
"Where's the High Priest of the Theatre?..."
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed3cafb7da7d7fd09ef169b5191f51a398189a504d4feab5134b8cdb0e403ab1. Chain 2 (Bitcoin): anchored in block 960355 (2026-07-31T05:49:18Z), 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/USB961553204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed28340e7da004da51defa049b8c2749d3f76994a5309e4ffc558f0453b06552. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/USB961553205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0580e05269dbfd0970025ced0d105515f9601a3ca6fe056d6247fc936e64d192. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/USB961553206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd90c8d977bb5777c19b93e0138575cc7892745178061b1985c5889b668397918. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USB961553214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ead928657d26d51e9c930c8d4547cb1fd2f4b04f258f61db50edfb0eef27e5. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/USB961553218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39de94c086ecaf03924864270c4fe6a99e528e968606c90c8696f0100e62c0e4. 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/USB961553224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae64de0918caf5baa0d934b227095e7355d0fc9d2fab8bf345897a23c7ee6117. 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/USB961553225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc9cc98f653b840e6739609b6111a0456c081f9f2a9930ed0869b89dcc914c6. 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/USB961553228.