Rabbi Daniel L. Lehmann (born May 14, 1962) was the President of the Graduate Theological Union (GTU) in Berkeley, CA from August 1, 2018 until February 2020. Upon his appointment, Lehmann became the
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 0x0047a26f4c8967a9b48fbcb8ccb7826ca1555a1ea927ba9df1137d496d907505. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2f99d094-c05f-43a4-88ce-6d0a950ddb52.json and https://artists.proofprofile.net/proofs/artist/2f99d094-c05f-43a4-88ce-6d0a950ddb52.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 0xd95b5b60b28e745c9122cb8f977c203c1eb50ce1afe7a6dc4de94c4a99e78b5a. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/QZNWQ2217691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e912e13a49941a4b41beeba42e063cf62d36828a449366061e79b00409c263. 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/QZK6J2169890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ee303acd91790eff8b40ade0e2508ff9e842a4a4d70aedf12cd5d015b1e6dd. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/QZFZ22202622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e9c487ef899337cd7b495c3f197197405aa2a78d72f8aca0e7a68f5602d396f. 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/QZHNA2190999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x784f2313f00f5fdfa41ef029388ebe79a7b96c21f34b7f9bc301fd2fcd5f79a9. 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/QZNWQ2066099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc352ebdbb665238f37a634fdff6d731ff8162004bef44f3fad9cd728c6cb03f9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZFZ52104629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee492614a97564e47bde8277c765d79e3ef605cba1825ed0e01e05f2315ec0ac. 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/QZNWQ2065185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989a10e797d8fdfca2369b37f1dc0d5a15ff788cd4de17c4d0f18c471505b05c. 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/QZNWU2059419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1087ee6afec93216200a38ba9f15fdd8fc2e1300bc8e66178d5cad0ba5c4fef8. 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/QZFZ72184581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x916d27485f93ca04de569f995e183a2aed1c3ab0acc392231b0d3aeab671b156. 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/QZMEM2084406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e6c0ff4b6dd40175740d9c44eb9cbb3fcd96a1761489de28e9e161205cb534. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZFZ22090174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c05ba27467644f45b5a532f4eee7ff6a4b04505f41729f884c9cbc6e4f147ea. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/QZES82082586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb8723ca41f802e232f4b7e44a96bda3bb581ddc0adc2b7c2bdf7a19388e599. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/TCADX1855323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a7494d55bf0d0fb2ec29cc939d876109171b751f2a5d7498802fda738e9ed2b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/TCADX1855326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904a0e13fa2a3b60a9640aad9956378494adc8e73ef8109d63f7f818d5d808b8. 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/TCADX1855380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa12757459204a09eb0e9c335949414a9122b5f7474ae99ffb2cdac90fa1c56f. 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/TCADX1855527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc66ee0fac847aa957fa400529edbb7bbdbf0c45c6337ac749231e21c491df3. 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/QZTB52229792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89df0a1f356d7a000144ebf41524b88887bdcea794e9b0467791f192bb685a09. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZTB52229793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c7e60ca4ee88a5764de4503373bbe6479328c0b8ffedc40b5d3a549512db05e. 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/QZTB22293630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7c26fabea7aaef3bb606b868910c4a0d6df60c5540e5248b447054a1a6acf0c. 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/QZMEP2284920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c7bf19c8541eac76ca98fdeb8a639fbb330b33ea2ed8599ebd3f7a1c694b59. 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/QZK6G2226030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d6b25dd6914d4139ba1716ea7add316b87959a87a64b3b480fe81cc299299e9. 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/QZES92230050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2b601d13efd079008484afca6d03eb2ffb7e694246b4db2ae9aaea122b2c98. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZES62237055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3be1a6a524305b375da1584f1bd65585ed675e24b088112787c9ea147e7b3939. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZES62237056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ab8cda6079bc29c15d0502da259aaa1bfa4ecd06f890c2d8d0502c6278c0b8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/QZES62237057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba55f4bc693ad78f0bbaf50074de95a41e2825c400dbad9a15eb7837bde2c863. 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/QZNWY2189132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07e912e13a49941a4b41beeba42e063cf62d36828a449366061e79b00409c263. 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/QZK6J2169890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cacfc97a832cc235f7c12a792b94921e0a8347f1cbe9cd17f7943367f52ff0. 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/QZHN32174175.