"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
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83be3e5ed77675f3406089057912ff126f613032ab2c5657dec3b16732c779e4. 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/TCADP1886202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ac7e12aab1b87029179b62dbea2efe9c7f38eec43a22f58151130aa60241e61. 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/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 0xe56c0a9cb3129eb30ce75b1c8e524a0ceb46ad68bbc2fe76d9abc9a8d191016b. 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/TCADP1886213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf664ddfdfebc2e82a02e21106012e01a9fec30a096f91d8fbfdeb130f1054163. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCADP1886201.
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 0x3ed03114e9e5965f454e707a199d4269ea2f5d0ae46ef8359e73894d6cdc4ff5. 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/TCADP1886207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e079904456fd6e3ac8845c44b68b9b58b8b6e974c648c768c2d78919621310. 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/TCADP1886214.
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 0xae004c10a55c2afe35b712a194cea3b0a95af8056ce0de25467ef545686491c9. 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/TCAHK2385709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd83f3971e1ab91db66ae543b28dcf0b2c9cab58f9affee998411851905b23ace. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/TCAHK2385716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765421638ed7aea989d678b06ac8dd829059cd02c94537d97be2e0f546de596b. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCAHK2385732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e80005393c1334c5db792516e01e88377585ff5e377f9cde45d75b995964d6f. 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/TCAHP2333619.
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 956312 (2026-07-02T05:09:12Z), 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 0xa637b7f6ba3927f4f7de9e5f03dd4c8ecc32bd45940804121e0e4cf42f5d5e38. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TCAGK2281123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd4183832841da570dd1c646f868201ce34fe2fa444b04c9a52a9fb25bb0a00. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/TCAGK2281142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb39a0b3f307440ae904ea863ba9d7ef189932a0356b9b5bd1c8b3b8c13902176. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAFS2154525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92c0183d917a02aa79aee9bbf84dc9bad18ab18f1af95b8213edb693e9957dc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/TCAFS2154529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91897efde272127c07d68a17ba5cd0cdb3328ca35e894d2128d14ffe798c6c37. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/TCAFS2154531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9619130727de3784905c8463c1183b3eb4d1c01a03103a7b548343d3e97e309. 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/TCAFS2154534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04432c7add04ec5ffd370677a41cbb2562a9b18f3e72d7c014b777dc729c2cd. 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/TCAFS2154523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d2a47ebf07ec97c28dc39277aa011e5d361174595a1973879a19f0b1e8e8c08. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/TCAFS2154539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cebff528196264534e024645cf57d1c62940bf0f4c5c04ed7b336d97915e3c2. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/TCAER2060524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07e7d1458894bb7d9f213fc3cc863994b61f82a07658c0c488b7eb64172b171. 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/TCAER2060531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fb27e74ea9a58503a14970b4679c006145450f2b5ab70118deb221c62a78844. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/TCAER2060533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2967a6d04bbe450cef51111295707d5c071fcac9df0554b013961f5cb7c4f2a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/TCAER2060535.
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 953528 (2026-06-13T15:41:10Z), 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/TCAEG1946193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11594fcd84bcfa2e752e656f2ac7349542c96463f85d41b2af59817ba0d9931e. 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/TCAEG1946187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14b5caa3501d77755bc021371227abe880b9422d87fafa1254ba9c3c4add03f3. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), 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/TCAEG1946192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb988d9c8957b5ea1ba448625f35160c28a2b47ff1ac0e0627cc09ea2fa3496bf. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be11ba5ff967763e7d4631c28f39c1e38aeefe0e0717bdeb9df56743810e778. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/TCADW1835052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9585eddba22b6fc2b6c8735d3657039fbee56de8ba13e84d804e93c928dc8b05. 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/TCADW1835055.