thumb|Roland cleaving a rock with Durendal and blowing the olifant before death. Durendal, also spelled Durandal, is the sword of Roland, a legendary paladin and partially historical officer of Charl
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 0x6f04514d1e0c2ec711eed03a326e2bdc461afdf05a15c2d26c4b40c6174974ed. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f194ad0-ebf0-46b3-9311-22b0d1e83dcb.json and https://artists.proofprofile.net/proofs/artist/8f194ad0-ebf0-46b3-9311-22b0d1e83dcb.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 0x298eb43189bc434be2b4f6ee6ac18aeb9bd088595c75bb2759a42841c070fc53. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZHN62449814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15def2877c92d6543ed2d673ac6b2f8e30c0f8859f162c88b42b4de1d53d3aec. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHNB2400352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07813311750f8a16f934902d75502aee6e09a9bcb00c4bada540cfada192a61d. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/QZK6L2446362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15def2877c92d6543ed2d673ac6b2f8e30c0f8859f162c88b42b4de1d53d3aec. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZHNB2400352.
The Gun Pointed at the Head of the Universe
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a1820b279bc1df0e49e5005ffe00bd3e581f40db96f6ab647609a453413458e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZK6L2446363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef9f0b165e8af855a7cd83d46d750aa3d4047839b88fe410d9262f5beb1386aa. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T12:28:20Z), 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/QZK6L2446364.