thumb|right|Common raven of California (Corvus corax clarionensis) in flight A raven is any of several large-bodied passerine bird species in the genus Corvus. These species do not form a single taxon
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 0xa98c5a7436ba48a0a4ec831fe5a89949b1598e95a17bc394717dc3b7bd4e52ea. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a4db031-68e2-4952-a011-56c5f497cb2a.json and https://artists.proofprofile.net/proofs/artist/2a4db031-68e2-4952-a011-56c5f497cb2a.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 0xcd9262a91d6df03563241c318a30c21e8d18899e209c2c2fb983557a1796ce39. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/USYBL2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bfe529c93d2e2c07d439e7f56ce6accc93bb95c179a5897e7051e1805fa5913. Chain 2 (Bitcoin): anchored in block 958170 (2026-07-15T18:59:46Z), 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/USYBL2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45427d21999498025071aa3b5de5d9cb606caca529080ae7f86da1ceff54baaf. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-17T03:26:30Z), 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/USYBL2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7832325ae69b1e7bccad8e98c014ddcad4ea89a8611e8c25738ee3f5adee4a. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USYBL2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f3334ce25363f2f42dc82ea9e1deb9fe44ae3f0559c3e965a7d751ec46483c2. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/USYBL2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x727c7f0b146bc2f18cab15dc08d2fa6960184d7da5c4be49648fc4a9c1120237. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T13:03:43Z), 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/USYBL2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd748b52623cf45189db258cfbed7b1fc09b2d3e1c0c5bd23e98691fb7802a597. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USYBL2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b786923a5a0a0969b58f750078c201b09ab70f2bbf07702ec1e7eb25faa085. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/USYBL2500010.