John Cowan Hartford (December 30, 1937 – June 4, 2001) was an American folk, country, and bluegrass composer and musician known for his mastery of the fiddle and banjo, as well as for his witty lyrics
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 0x7bfaf31011f42a75ea007ed070610567cde75c8bd3d549b943120f9bbf942976. 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/86397db0-9880-4e74-be81-1cc3c1f6e035.json and https://artists.proofprofile.net/proofs/artist/86397db0-9880-4e74-be81-1cc3c1f6e035.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 0x00f15b9e74bf7bf949653e03946c4b25682c7e9cc3b5c2d6910ede447e5c1ad8. 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/USWB11102422.
Steamboat Whistle Blues (Live, Bremen, 1977)
Telluride Bluegrass Festival (Live 1987)
Backroads, Rivers & Memories: The Rare & Unreleased John Hartford
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec300b7787e6841fb1ff7a9203d51bb9e858c2e48ebd23d4dcca8faa0ee67adc. 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/USHM81069639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50f03569c59e14c237c73dd7c3a11412915628c7476d04411b32c9f435db300b. 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/USFF28002803.
Old Sport: Texas Shorty and John Hartford
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d288b419ebf9648cf02287a3e360c0881282d3588d154ce9383650567488fb. 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/USFF27602002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ae11cbfce8b44a7f327bfb55266c284ab3b698d804cae68e48f044beab54249. 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/USFF27602003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d2b598284483234bc36681026ec8118020a68ee1b2b36c80992fd69a9fe216. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USWB11102428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfad370b74557ae85d45cca607b0ac94c21f0f14693ace06ecc344dffe931e8. 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/USWB11102429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cce47e38d9ae797a4b2f2a48acb9f4683d6a8b977ff69d99b013435351d1b97. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USWB11102431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b0241c9229a9d5aa5fbb6a08ac92c9e63a449d67f217abf2e4b1237e6b0cdad. 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/USWB11102433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6cbe3bb499bf42e0d4e6c650f370e078e58b60960bba61828d45aabe2f3863. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USWB11102434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fa5a7c8de39f764274d754e77c803d7b8810d255de31108194c92b9c2fad4c9. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USWB11102435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea025c5e4db20bcd41060a421b3a9fc304893caac3d1e81baae638c0d2c17b05. 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/USWB11102438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431a53f176afd08581f4d4a0cfcf6c4eaec8102bc41e7abd5d9f8ea2c3e844e8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USWB11102439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b283dc82829b40d8dbb1402e70617a5d530a9b657677dd9267e9e0a2ebaf5c. 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/USWB11102440.
Gentle on My Mind and Other Originals By John Hartford
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bd57fb2548207c69b5df1b080578d23d22207230113bedd5ff35169b4e0a3ce. 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/USRN10100443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350d69d94aaf44599bfd0b56b8a278d76334b91f17eac0c513ead9dc5dbd8c8a. 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/USRC16908477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b4f6ce34238a8be82e6e6270b06521d95789bda25f97ee48d2394a2ee8b5f7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USRC16707675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b4f6ce34238a8be82e6e6270b06521d95789bda25f97ee48d2394a2ee8b5f7. 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/USRC16707675.