Bob Brozman (March 8, 1954 – April 23, 2013) was an American guitarist and ethnomusicologist. Biography Brozman was born to a Jewish family in Long Island, New York, and began playing the guitar when
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 0x835310d53f1d8f8d2da2590c0b8898f33e89a706472446619c0e347d1bb2c3f5. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ac20d01-03ef-4c63-aa8a-1ee557a11570.json and https://artists.proofprofile.net/proofs/artist/4ac20d01-03ef-4c63-aa8a-1ee557a11570.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 0x91478713840c94ae23c54a822b08a6f6f7c69616541a740b18bed0339a5dc01f. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/DEFR10500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe256c89a014e2628dc848523af13ea49142abce07ca224d8b7ee7740c1397ad9. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/DEFR10500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefba2dfc6d0f80187ae69f08489137f32c59147a22da3a398ab16de96bfb8fa0. 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/GBDTM1057001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40dd8dd53b803cad37d053d165c1b4873c49c3b84cb47bef69a98aae0a1eeee5. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/GBDTM1057002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279f063f9514fcaf50a3a4261e7afe3fc99be6467d51403d5b5f423ba299a730. 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/GBDTM1057003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790a1880cf873d3aa520e7b119f40b005b5a9333216913662f6bb333c362b61f. 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/GBDTM1057004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf22913b7795ff4265dd6ff2befec8f1489473a5da611d2f8d9acd683b4581af. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/GBDTM1057005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbf0f68b3031474c9201f81255c97abf8cea6e38d09b40dc53fde23b8568fa24. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/GBDTM1057007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4844b64816f1bd8fa1c69f41e6f28e138214c5b40df66ee7c7623528487c24e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBDTM1057009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a16efada4b7ed0d77db234ddded7b357618087c3b3203a8cd646a4117fd3050. 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/GBDTM1057010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb026d9448679f5309ebbfff25cf5d0fc3dd2afd1f4c1b32d1d95d2e23ba94cb3. 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/DED339915150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x132539baeafab82e1fc1fae3370c720290a604a7c2fc5542b26403e5363ea705. 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/DED339915160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c05de2ffb220327a61bac6ce31ce1119567939886625c53f5b50d5fbd819ee. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/DED339915170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20d20e8513bd8d8b1cb53a832363c8c179280cfbcba7bc03535f8976c246b8e9. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/DED339915180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fd5996a0b786800fe3b5a3ac59947f763d68fde836b7b5c032e03be96b6d50. 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/DED339915190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1edf70e1b085afde681aa1a58836ded526ab4ca50035fda6ecfd3a581fa679. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DED339915200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe49e2a9544a9790c703f85f9318388f98b9d10993b20686a0ce72eb27591d15. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DED339915210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5685824f07c7f5cc12a05c4c8f1837fa8065147de625a62fc4d058fd4fc746. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DED339915220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bb11213c843256f89d0b6e9d3eb89990cb9a0c0356b1c653b8ead0b461a5fb4. 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/DED339915240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7f8cd6319063e3e0e3413de474293c17436c9a540385956819f6968cfab823. 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/USFMN0610106.