Thomas Andrew Lehrer (; April 9, 1928 – July 26, 2025) was an American musician, singer-songwriter, satirist and mathematician, who later taught mathematics and musical theater. He recorded pithy, hum
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 0xdac7a8c485a7254cdce84bdc7fcf910e0acc64a3230c49ee2a37ae816d746caf. 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/54dfe370-120c-4df9-9509-85560ade70a1.json and https://artists.proofprofile.net/proofs/artist/54dfe370-120c-4df9-9509-85560ade70a1.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 0x492e57144b1a27f3033cd2fe35aca6db8ec641d766d4553842d6ce95d2bbc41f. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/USSE91031644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f46f476ac1aef2d76011420c3258e237edc725b5fc47068277dc333d3c180b. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USSE91031645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaede7be9e14ca9b063bc8bfd18caed3ce79e7004ec667c95be169c2708b5a7aa. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USSE91031646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd263e243fe11a200f733351aab8f9bc0401d14620f33c2b015745a9fb08458f0. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USSE91031651.
Satirical Witty Musical Irreverent, Vol.4 (Remastered 2023)
Satirical Witty Musical Irreverent, Vol. 2 (Remastered 2023)
Satirical, Witty, Musical, Irreverent, Vol. 3 (Remastered 2023)
Tom Lehrer - Satirical, Witty, Musical, Irreverent, Vol. 1 (Remastered 2023)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4245e4cce89cf819d161b744139ee138e9e95f063f5f132239481cfbade2cde. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/USSE91031665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cd9288cf02d63cd2b80f34487e052cb176e33950cde1421d7f985bfd0a8a87. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/USSE91031666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb46dabda78ee87b5498298feb2313999000383bcb619ed770a4b42be2e4cd5. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USSE91031667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc300e96c31408f4ac20079201ecafca204a42f7c179f7c74cea56445958da245. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USSE91031672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9bae2a94cc34efe209a470e09cbfd5dc36f47bea895dad27867688d2961918d. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USSE91031674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d495feeafc412e7f2097b3feb8b0a8e858b626ec77d73ce3ec3973fdec8bd9c. 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/USA371373272.
An Evening Wasted with Tom Lehrer / Tom Lehrer Revisited
Laugh-a-Long-a-Lehrer (The Dave Cash Collection)
Satirical Witty Musical Irreverent, Vol.4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacee463e61fb54253c6d99567efbb604b3694c4c4f17590d543e8554bef22f94. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZW9L2347821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0c68c61a6f7a72c85ae5445cd3ddd57aa36f834082acb9df2361ad3ba9d3a4. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZW9L2347822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdacf5e21281592e415a4dcbc83753014c621234bc2aa03a3b8482dd07f9cf6d. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZW9L2347823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c1af4b46fea524b08e78590c70aa5eacc4b26f60057277967eca1639acb340. 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/QZW9L2347824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c67c075397ad219e0a572ba81bd0501d77d680c73844de36fe2e03e853ac258. 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/QZW9L2347825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf426966fe2e2a499842ef7e9708ae8d22ecfd87948fc13cf41ae31dbaed7738. 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/QZW9L2347827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf54b5620af19138d56366fba9d17b75bb7bff071c588bcf922211ea0e423dc2f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZW9L2347828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5ab19f544d83e7a10c1410907cc8c6b654fbd612a63c09a5e2a6c56d6455ce. 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/QZW9L2347829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb9f3cb8f89ea46d127dcf663af43d6dcdf7485a0826cbfeab85fc4227d31660. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZW9L2347830.
Tom Lehrer - Poisoning Pigeons in the Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca224125a8a981864d4491fc51942556ab77e97470cf010c1d322f1f0545752. 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/DGA052379132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae3d52237c91c545b9e810d3e6380669ddb52ac51eb772778f4a980fecdc466. 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/DGA052379138.
The Lehrer Laugh Factory: Greatest Grooves & Unleashed Laughs V1
The Lehrer Laugh Factory: Greatest Grooves & Unleashed Laughs, Vol. 2
The Lehrer Laugh Factory Greatest Grooves & Unleashed Laughs, Vol. 3