Jacob Mann (August 26, 1888 – October 23, 1940) was a Galician-born Jewish-American historian who taught at Hebrew Union College for nearly 20 years. Life Mann was born on August 26, 1888, in Przem
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 0xc06f27362faac05105079785ea3b099feaf1889261e84bb44da2d6abdc225c5d. 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/e27c56c9-6e89-4471-9840-ccf4a30762a3.json and https://artists.proofprofile.net/proofs/artist/e27c56c9-6e89-4471-9840-ccf4a30762a3.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 0xc327facb24d9736c32a94986580c2da224e9327482bf554470a9b58b225c7ed2. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZES71982140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5187bf7356c73d1873ba10e6f5246d840b063f9345646c739eeaa32f106845. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T10:20:01Z), 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/QZES91986121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48e8f2b2bb069c2df669eb99168b8c47bf6e1fe15c312f67dcbc0a689ba1bcca. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN72072893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7dcb9bdb8d8608ee6d552e118966c39eb8452d751d18e071a6a179eae7eeef5. 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/QZHN72072894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c399e8016850fe8ffefe60d56cfe9acc32587e5c6cbdc97b96c3a04d21d7047. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN72072895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4fd0445fb313b966c6f87988e56592bf678c02dd4440fe01cb9ad1c1d6da71c. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN72072097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf325ef7543179eaebc59d2439895002a6beddbf5e1666d85ef80c8391577a2f3. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZHN72072896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc93ce0f67df470f1aaed35c0646a973156f53c575e4662990e5590caabd45676. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHN72072897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5556e4d7f8737707e64ad7ef9ff4ef6355f4320acfacf04edddf35be9b37c2f4. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN72072898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b8350e736056b6e5b3a434e67efba8b5fdfdc599e2960b632f9383ef98af0fe. Chain 2 (Bitcoin): anchored in block 958817 (2026-07-20T06:50:32Z), 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/QZHN72072899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49197ea37a2a8414676d3a032a01ff2c8ba713a318face2aaec897255d608d1a. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T15:54:34Z), 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/QZHN72072900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d39caf05aed39910675da033ad18ae08525ee4a5610a97f6188babb003fe301. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHN72072901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e52722069e53b602c77041bf4b360679ccff6718d030130fd8f38fdc8e8269. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZZ7T2409880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79dacde6dc0a72bcb50528febcba0279c2c6c3f841fc1eb5efe2d9283dd05673. 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/QZDA42139327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd213b27f1761f6d5d7af565638181b8ec7496e1ab00e899dd6564e252ae0c036. 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/GBEUE2400105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31ab01d1fa6d9edfc3d6c143ce0dd178111e2a0042bb5ea8704afe8e860bb520. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/GBCFB1700467.
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