thumb|300px|Like many mammals, grizzly bears are covered in thick fur. A fur is a soft, thick growth of hair that covers the skin of almost all mammals. It consists of a combination of oily guard hair
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b27e072af7f0e46a8c5d923abdc15a06dda8caae13e54b6305771e0d168875d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5712b5e9-8a09-4a72-9683-95da4d762000.json and https://artists.proofprofile.net/proofs/artist/5712b5e9-8a09-4a72-9683-95da4d762000.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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3523de7c59917d8f7fc3a954e1eed08b43aba063d72e440fe3c29fde25df27c8. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/QZ93L1924312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce79692aa3373646c40b7d8e5f1f9242ff57d52fdfd71cd15be611e1dc259eb. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NO8WZ2106040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc45b10a031577262da3e4726ab8f8e2cba1eca428ea0d5278ca3d3dfd5e756. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NO8WZ2106010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfbbd2c8bf925ca86ca9cd8fa57060b3ab1db97b2e13fba48016f13a855c0b3. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/NO8WZ2106020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc45b10a031577262da3e4726ab8f8e2cba1eca428ea0d5278ca3d3dfd5e756. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/NO8WZ2106010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x002bbc989cdff21ba29ea667195c799f35fab27141bfa42651e69d36bffb4856. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/NO8WZ2106080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcc1300d25819bbba99ac24d1cbee1d97144fd27097da91883a8e5b9583bb3d2. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/NO8WZ2106100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87d92119df83fe18c4734c9df349c1572f68955da4db8113d31edb7b6ad5355c. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/NO8WZ2106110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53dd8701d733ecd14d5acbe2adecef0f5c4b6be29d975af369b7a546d92b443. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/NO8WZ2208030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5192ec3cfbcf1b55f68cb87730a12dd4fdcb963f27f465c5af76d8a6ef78cb88. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NO8WZ2402010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e72b225121de862533e2c764ca892194999a2b3c1bc9278bf9e34132e403f5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QMB622200904.