John McEuen (born December 19, 1945) is an American folk musician and a founding member of the Nitty Gritty Dirt Band. Career Solo work John McEuen was born in Oakland, California. In 1964, at age 18
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 0xd2e1ce35a2ff06269552760e4a6440251456b466ebd4caa1b25910c77bef137b. 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/1fccd82d-6360-4182-9528-9e38eb5c04ee.json and https://artists.proofprofile.net/proofs/artist/1fccd82d-6360-4182-9528-9e38eb5c04ee.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 0xf6b62eed79f4b59dc6a323f8d5376b969c5b7dda2ab876b999be000a5486891a. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/USVG29552492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e966a2174d2c323650d1a7af25d04ac8ba4ad07b87bd7a5bcd749a5ab63b644. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US3M50782102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53510dc45753e0286c4c226e39311ac3340008b0fbcd60ca22aec3464d4cf73b. 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/US3M50782104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dd4b18f790ec05b726c1b630bddc334d97404fe6b900a57004275f5cb0d180. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/US3M50782106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961b68a03fd9847dc8d6214ba7b9bd859ebe6df582b19835fcad27e06984bbb8. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/US3M50782110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e4467819b783bdfcccc7972d65759db3d41c2d8a52e518e1a86dc9f88d232d9. 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/US3M50782113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a9aa591c42cff2f4f5c1d4c56b9e605ee5c7c89315aaab9ad06741aafca4ab. 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/US3M50782114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9e7c4396da9f27743bdf4f637bba9c5960bc0697be834c4c76e4d450b31cd8. 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/US3M50782115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bfe9eab020cfe75dcc6fb02b4ba1e8622e1b73bd68a847a2e04d1bf7aa7dc80. 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/US3M50782117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c155f37379ef485f745d8efe720e44633ad153839b9623dfea99241b777aef4. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US3M50782125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c23d30682e77ff18f5360c3b906e86e551243a8d0b2e5732041b61cfe84c71. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/US3M50782131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48941356131e4d398cc04ea22c42469f4dd5551e83c38bb77f940a1020c6014b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/US3M50782132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dbed5c8991d762065bcc22579f7d8af803bc591aa29a85bd34a2c45b77cd60. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/US3M50782134.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7afd1282a074649a1922189efcd4bb0495d1e38e5ff12bc5488e32e85c067588. 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/US3M50782137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b9dab1ad2a0c38c510c6e86afd7ac76f952c5f127f64e32301158faf7ea30d4. 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/USSM12004576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba2f9343b890e7aafed41660721aaee3d893f4bdc8715ce9188cd89ff1ed493. 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/USVG29750949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb41279d8856e0dfca9be69248f5957b6bccb134b26d82bb44952464aa87e48. 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/USVG29351533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba2f9343b890e7aafed41660721aaee3d893f4bdc8715ce9188cd89ff1ed493. 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/USVG29750949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12446a22eb5e54e612d3b4c5cf80400f3dac058dc407378a55f1b90776bff28b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USGQP0601100.