Gerhard Fankhauser (1901–1981) was an embryologist known for his studies on amphibian development. He was a professor at Princeton from 1931 to 1969, where he retired as the Edwin Grant Conklin Profes
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 0x1351a98d56a4ec42b127d4677993614d50df8941c78d0eca4b9bb0834dcb8bce. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a5f33ebe-42fc-4565-8127-ce12ec7dbd31.json and https://artists.proofprofile.net/proofs/artist/a5f33ebe-42fc-4565-8127-ce12ec7dbd31.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 0xafc1288765e85ae4f1f34cf968b8222381d29112d35b409a83af3226796f37db. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USCGJ0741225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec738ebd890d1e63067123bf39a045d05cf5f5bb1c35c00010eaffd27d5d5ec1. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:11:26Z), 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/USCGJ0741228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2cef6afaac3c6abf54f7e5bd7bf8a82df18c32d0acf67586bbc9ab354beddbb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USHM21336226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2c9a9ba87a430b5e68b1f731a8b7d8b7909bdc3c4eb3b8be65f0ef1b193dda. 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/USHM21336227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f52ee3295fdb80a104d2df90ca1e04961b3ab8d4e10684f8bc16a7a16c55ff1. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USHM21336230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa70ddb448e9c3d573aa82890d83a2395b557bc3c06ab0b2aaf3c99131d0b389. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/USHM21336231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265e3e68a57dd11622358cb9aaef913d4fdd3b1f3c5a523dada3661d84f95843. 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/USCGH1946204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0209e78e45a7d790c124a1014c6eff4bcca8e3112dd1b52dbbe79f10b29a0ce6. Chain 2 (Bitcoin): anchored in block 959015 (2026-07-21T16:08:00Z), 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/USCGH1946207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7db3db3c04a5aa48de35026970282660fe124ce92e262a1147011a442b3f5e01. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USCGH1946208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d8ffbec28c2b01b2a891f592642bd1a5ff59e9dd71c2392f4b52e458decaed. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/USCGH1946209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed03337192ed0d7b53a5cafedac9d7833fc3f09da82d052069234830c26a0af1. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USHM82568942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e0c39f24e941e361f56b742964942b1ee5c64eadab99afce92b98676917253. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/USHM82568943.