Bruce Langhorne (May 11, 1938 – April 14, 2017) was an American folk musician. He was active in the Greenwich Village folk scene in the 1960s, primarily as a session guitarist for folk albums and perf
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 0xbe2885bec3523cfd5ad197626e84af70fdc67ea2c3df62f6c1ea9686b0594b4d. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1531502-a7c0-4620-ab6d-eda718dc4e4b.json and https://artists.proofprofile.net/proofs/artist/b1531502-a7c0-4620-ab6d-eda718dc4e4b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Hired Hand (Original Motion Picture Soundtrack)
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 0x02c70ca90ea45e1956dc2d4e965a0eb473e86509737174194a875fce20eb6f64. 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/USQY51582655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3211564216ffacd39e97fa79c8f96cdf22dea97107893ca0f48f9a7dc6b611af. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/USQY51582656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7f0a855f7d5cf77516c4d129b6f7ee632dbf3fb65800a336bdfe5d3655dac8. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:07:08Z), 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/USQY51582658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10f91b5951492190070480d8b3bf120518e7bb458270228b27469b316c2e8b4. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/USQY51582659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d2c377bc729de8de1cf1f152baf5924b54d4eafa5863a351304dd4ec5a5f9e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USQY51582660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b003b98a90a72612134b639447929add82eaae05481f11b3366489b205ab57. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:56:21Z), 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/USQY51582661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92484daf3c89a7616098e34ef257328c263345108257b7bce6b96910f71d9c3f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USQY51582662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8f046d14361cd1191f16c9c0b016c2d4f574b4e732c4d8d000898172b969009. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USQY51582663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f2cb7de4f2943ed4767ae8adc8343bad363e97f0c83725e3e52a39c4bf27df. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T02:58:19Z), 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/USQY51582664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1988476613d580190528116b1d0b18f9f7ced99a733e7bf332724a8c6f17c800. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USQY51582665.