John Kahn (June 13, 1947 – May 30, 1996) was an American bassist. From 1970 to 1995, Kahn was Jerry Garcia's principal musical collaborator outside of the Grateful Dead.John Kahn Biography, AllMusic.c
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 0xfff352dcc0e1ddf0c5ff624a2577d70e7eaa359a7384c6f27496fa7b36cec5bd. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a2dac1e-9f24-4b0d-bb4b-52500e8379a4.json and https://artists.proofprofile.net/proofs/artist/2a2dac1e-9f24-4b0d-bb4b-52500e8379a4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pure Jerry: Marin Veteran's Memorial Auditorium, San Rafael, California, February 28, 1986
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 0x8949b5e3fa1423d68569f164b65bb6be290a1cac02305adebc9a3804d724387c. 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/USATO1600464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed61559a05d4c5cafa2346720de6eb4b4365ba10e09d15712c958e6e79de7a8. 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/USATO1600465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f10461c40dbfa91c690a5ca75a5f5e9b4ebebde3e639c06cf656129f9830659. 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/USATO1600466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x336bbe4a9dc66c82d7f5895797a3895e0400b27421875bb5528053818d23355e. 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/USATO1600467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb83c1669348c14639d382155db85bd36458c149ea1a6e7330b541c971d0b04. 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/USATO1600468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd555fe565df81021becde2112cbc36932548e24effd03fc888d64d0e83a704da. 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/USATO1600469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x491737613de0ef00f13b042a4b804ded4b61d58aaae20392b6c8d180156e8306. 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/USATO1600368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf66fa515da4c08c4c9dac58ad9d390827256f1bf3f37b3baea445a10f64cf101. 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/USATO1600369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eb45d7732e21d0a00108ec3e21e67da3e65e5d9f97a9327d1e98ad93af3dea2. 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/USATO1600370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaadc84569a75f8bd48761274142f9e2626607ea693f35ffd2289b9ed147707b7. 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/USATO1600371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f2d88072d5bd8dcaadf95f6a318cfa83d3d279c8593e9578bfc4274f504314. 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/USATO1600372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd679fe3f4770cd35dbafa79c44f7a1eb2e2821df9578b52f76fca6b4289008aa. 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/USATO1600373.
Well-Matched: The Best Of Merl Saunders & Jerry Garcia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69735ec564a84a91d58b5acf14a9510d0c74b3891f4b05df53cb5758376ae8ea. 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/USFI88800222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bace2ead67bcb9f4dc802723e6ecce465ab7891c98d2c601a7ede03dafbf924. 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/USFI87300369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25a217d158714ae06034b61d3892897a778ca8c276240e0ce41e22f3074fbb0c. 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/USFI87300370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be51498b18f75968defbc9b840bdb94a1a8fc799bdc31ede16c8ddd57f9695e. 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/USFI88800225.
Deep Elem Blues - Live at the Berkeley Community Theater, 4/25/1981
Bear's Sonic Journals: Sing Out! (Live at the Berkeley Community Theater, 4/25/1981)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ddb9b734e13a073f1b046ff52453e91b33d2bd4d7aa9c431377f20184d65ff. 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/QZ5RT1600309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520b7c6e1334ab4b50d392521540570494fc5f4bcfa6436a21c18d557e71c478. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USFI88800221.
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 0x541c4c17779baad64d148e2399a199f86c587cff6e7e8e55974643e7b3b8ce19. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:59:27Z), 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/USFI87300372.