"The Checks" is the 141st episode of the sitcom Seinfeld. This was the seventh episode for the eighth season, originally airing on NBC on November 7, 1996. In this episode, the last to feature the wri
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 0x91132070020f790d87db0d19d3b1be97c5c928e1f534212ef8876fed5802de5c. 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/8c7f2156-b00d-42df-9770-c079c642d28d.json and https://artists.proofprofile.net/proofs/artist/8c7f2156-b00d-42df-9770-c079c642d28d.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 0x7c436d4f78f398e0207d41f389906127a331c16218983b7ab9abda6082185c1e. 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/NZPC01100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05052a4a6b54f50431580cbb0e0ef29b90499da699583b07c492055531c9d705. 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/NZPC01100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02c6690128570e8f794a9d6a2576bce6082a0f70bc5f2b97889eed891edb6b39. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NZPC01100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1d378fb6193db5e6c59a8517c53196e360c705d491d8b5723600350671cc17c. 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/NZPC01100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6840d4af84eafdb9e4e34225552e9fdb360897f2f72f37d4e84d083ab23b67. 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/NZPC01100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86fb7936a2d0ae36d495718466408d328c117cf907575c35ebfdab75c224a41. 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/NZPC01100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49c742a21736ed873082a1254066ee05f4568d91fccc5daeb30df221067b53c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NZPC01100003.
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 0x1fc1a3b21447fac9c6ec4895d52df68f30588cdcd998a915a122e101586dfeec. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/NZPC01100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcdbc7da2f691e3f1afb37bc6cba366b8f0317ca5b7ef20cf60806df5de13fd8. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/NZPC01100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9fc406d126ebcdd96b7813083e3cd3b0b7f3c4e73571a127f3955001bd56847. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/NZPC01100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x482bfb46ec7cdd0475d42f88a08cb1396a829673dcc9a746e44a189508b1baa4. 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/GBJXP0802614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864a0fa23ffc1d3ff175305e01399a4c4b0ae16ea7beb4201436b3de0abd4c72. 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/NZDI11100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400a4f38c153096dae96e7e4fe944df51f44d364b3829e11fa3c03e1926d14d6. 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/NZDI11000040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76682598810ac20d5efe3a719f437125ec192d6e7c6a153086896a8fd1e99f18. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NZDI11000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc454b06d88d925b75bb42de1d6b478a227b7d57ed9d578383a3b145a49c19157. 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/NZDI11000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524a29313c7299a53f261a53e261076c9c37730141708580b06e9bc820a01030. 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/NZDI11000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6291023653e02dec3f76a7a3a054c5b6b0e8064d5abfdd4bdc4492b0c6bff89. 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/NZDI11000052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ad2df627ea99ddf9415d5f3211c1599943d58d723325d4eeb1c736944183e49. 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/NZDI11000053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0bbbbdf5774c48a628243ee8b75e9ba8b4a9eae7bb323c32a88e7f15a2e126. 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/NZDI11000054.