Marcus Albert Foster (March 31, 1923 – November 6, 1973) was an American educator who gained a national reputation for educational excellence while serving as principal of Simon Gratz High School in P
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 0x1540051d98d1322e3f4d384f80dcd6323cb11c274d055178c0a1b89d84935847. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0a8aa8b-75d5-4b4a-9dff-40ee8ac7c7f3.json and https://artists.proofprofile.net/proofs/artist/d0a8aa8b-75d5-4b4a-9dff-40ee8ac7c7f3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
You're The One That I Want - Live At The Flowerpot, Kentish Town, July 2010
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 0xd61b7df9367d4d790b02b7ceb1f8c5d2aefc636fac0dfb2dd676742a281bce3f. 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/GB6TW1100016.
Patient Love - Live At The Flowerpot, Kentish Town, July 2010
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58c9e5a772e7baea742a3a05c7c384a7e9712e6ac2ae43961296cdd85bdc265. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T15:41:47Z), 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/GB6TW1100007.
All I Want - Live At The Flowerpot, Kentish Town, July 2010
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00291c325529bbe7b56a86f6ea30d2d4544756ec55060c06f4c72ee7ea568034. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GB6TW1100020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8395f1685df16540bc91e169785d02930f8e8fd1c727ce36ad8a543052870710. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GB6TW1300043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e46f2768ee5273e88164ab4872fbb26c435ada0dfad6dc32fb78db260a74994. 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/GBKPL1672411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38e536fc06044fe9786c52bce386c597cc83fb1c8d64d5a0b92b83de9a35fc8. 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/GBKPL1672413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca25a8b521872c06f590025a26ddf125e36e7a823c111574b9461dc6c5e2ba36. 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/GBK4S1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647b5fca0e5379ffe47a603f250a60004db2c01b37bc86edc9d34fb6e1f50803. 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/GBK4S1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85c5dcbf102605a8528ff41ce200e76121cb063e84a8609cab13f4f75e61de81. 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/GBK4S1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa795eeb15e379998c66db02e1ee7b3466c6cb9e2f97047e64b5c03bcc556dc1b. 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/GBK4S1200005.