"Chair Model" is the fourteenth episode of the fourth season of the American comedy television series The Office and the show's sixty-seventh episode overall. Written by B. J. Novak, and directed by J
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 0xd0aa648f2a43817d98869c0c0e6924d05e6e794e84c50dec4ba50e686cc75c30. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/eff57553-04e1-4e4b-b9ac-09e5a0e28744.json and https://artists.proofprofile.net/proofs/artist/eff57553-04e1-4e4b-b9ac-09e5a0e28744.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 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 0x3ac7e12aab1b87029179b62dbea2efe9c7f38eec43a22f58151130aa60241e61. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCADP1886204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcd05a07e40a6fa370e2c5aa1aca09b1c19291c6770ff9e7238e46da3235412. 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/TCADP1886209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5033b70d703d3600d158ccb5d75d7bb01d6a5e91c72f1f56e01a0c7f17356f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCADP1886211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd51cad08bd46e2e47dbd33cd5e63a5aad18e5d96ee6224c6a92f26820d30bb. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAHP2333598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12da41981a01461d528b7a54f38b5c0dd2a1bd8d08653c3ff9f5177a505a3b1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAHP2333605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886d0a377aebaffe7159f4eaaf2e8e20070bd8deb7bd9f6fb16d1ca36eff2ca0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAGK2281130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc547df9ae8357e54838c029fc5ab4f96f3ddaa376bc7ea272bc0a91659b4e10. 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/TCAGK2281137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf485fc7fe7d712f2991aceb663e8f9ea2e66b1a873bc24e2954c51d7e3d387d0. 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/TCAGK2281145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92c0183d917a02aa79aee9bbf84dc9bad18ab18f1af95b8213edb693e9957dc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAFS2154529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cd6062c0592e480718892e064d5bb8ad14c69d616c2024b204c021dad8fc9b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/TCAEG1946188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4c68b715bde7f72bfeda4fae018a7a0ed0b0e76b483e3c030fe2a7f2deb3a1. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCAEG1946190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69afd86712d58be4d8f4972b59655394dc1ed95a7ee2ed11976ee41406f9b3d9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEG1946189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb723d9735d1c710659d57ed3792f3865424fd837d046a9a41e937c429dc452. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TCAEG1946193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb988d9c8957b5ea1ba448625f35160c28a2b47ff1ac0e0627cc09ea2fa3496bf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCADW1835053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa53af0c3981e417c69d035f6e997c14b5636d90e3f103bf3248b3774e56e319. 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/TCADW1835050.