thumb|right|330px|Part of a JOSS session at RAND in 1970 in which the user carries several simple calculations in . Note the difference between the period at the end of the statements and the interpun
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 0x376a100201e32c9cd184ff55c032755fbb050b2c6bb9f462bb553d766a03b390. 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/38232640-bf82-432a-a682-ddfdaea408b8.json and https://artists.proofprofile.net/proofs/artist/38232640-bf82-432a-a682-ddfdaea408b8.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 0x567e444f91cfe1ec2a28b1f66d130d99d89c2ce37e7141b4036df96b07aaca5c. 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/GX5MX2331687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5758fd6401c84f10ba34b8de2eb438423c07346d5976cdd20789e9cb1f0c92. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/CA5KR2439046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411af0d3e0965e069a55e6b4a65b1169e5e9304f897794a272e0001015644907. 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/CAR072400109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdf8fb48ec590c27dcb3c56049362f450ea85f25f98f4d806a8d1b7e270ca53. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T21:47:21Z), 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/CAR072400110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee8486b7ab0e8f2d86c36ff88ad4ac451b43f482b339f644f26cb19c18d86d87. 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/USA2P2424406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26d0be1160a1db3d58e9c4de2a22af581bcacd2a253bdb71ad1a4eb7f8fd7622. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CAR072400292.