thumb|right|Cover of Ulk, October 1920 with drawing by Paul Halke The German language satirical magazine Ulk was printed from 1872 until 1933 by the publisher Rudolf Mosse. Its headquarters was in Ber
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 0x01b7a1da66731604029c2d38704f3af0eaee46bbf7583c8c200e3cf82213a359. 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/00402ec8-31b6-4c21-9c72-fd9ddf12a818.json and https://artists.proofprofile.net/proofs/artist/00402ec8-31b6-4c21-9c72-fd9ddf12a818.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 0x866f0b4e223692e1fec08dd9178f528ded70481cb474b403267d067a01e0e388. 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/QZFZ41985276.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e3b554b3d443c7d1bdfa66d4d37a61705c3652e5caa83ae30860eb058405612. Chain 2 (Bitcoin): anchored in block 956482 (2026-07-03T10:33:57Z), 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/QZFZ72042929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca113b28d355a68ecee18b378a540f2e9bcefbe8f51228abe363c88409d8e592. Chain 2 (Bitcoin): anchored in block 957752 (2026-07-12T20:53:32Z), 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/QZFZ72042930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda59d14c50d2cb4a1cadd69d78e294be8596bb41e90ccb8236aacc97622e4c13. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/QZFZ72042932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb865d25db5db95fa23318dfc8a61ef5712de1d0a16d1b553934eda698af47700. Chain 2 (Bitcoin): anchored in block 958462 (2026-07-17T23:17:53Z), 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/QZFZ72042935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc08bdfb0c1b38c27eec0d7f21905856dec094ee1bc3fcedfd3aec6754bf420ef. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T18:08:09Z), 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/QZES52189992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cfc0005c612fafc64c57130be0052eb34f949a5e2aa42935fec40b936f2a89. 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/QZES52189993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc92cf603c95204a19cc7638872a19c5f9f45add1e453693f86717d826f10cd3. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/QZES52189994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72437a3b9e37f3321b5c94f49deaa35185bb5977c331e4dccb294478b5fe487d. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T19:59:24Z), 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/QZES82240742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82c42970b726d2b8e2b4840edd34fd2d60ee96e673585aaa4fa9bb2b1c935e8. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T10:50:44Z), 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/QZHN82494035.