thumb|300px|Le Moustier Neanderthals (Charles R. Knight, 1920) The caveman is a stock character representative of primitive humans in the Paleolithic. The popularization of the type dates to the early
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 0x05beab067c38ce0d11ed7a505d6ef137bed1808a75c505e856bb0c738fd03078. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35165f1a-ce58-4eba-b946-8a91bcaef23c.json and https://artists.proofprofile.net/proofs/artist/35165f1a-ce58-4eba-b946-8a91bcaef23c.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 0xd3084a0c9cf1d02de67e872435431eac2d16cedf0682bc4137fe3f89823be480. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZES82468106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26ceaa88d00ddce1150d60205e68ad07c2430c6cb8b0308434105cd85ef06e73. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNC2411975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4a6c67dc6daad76fe7131b1b0e6937b830f0553caa92c0722007693af05c4c9. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNC2411976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea50da0ad190cc85d1027af7d7a9fabba1b7ca67e5aac3ab9d27969dedcfbe8f. 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/QZHNC2411977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf5184df9a653b1fe65245b7d634fc66242e6b3712bea58b86f3dd018065fa75. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNC2411978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0059abb3bc390ed0ecc7bb3d24d59a6e89e33d1553e62358eefcfe8b3170f162. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZHNC2411979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3084a0c9cf1d02de67e872435431eac2d16cedf0682bc4137fe3f89823be480. 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/QZES82468106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebda31d1317532d8a8db9e51133745609124aea51645035d3683d2f71d996c0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6J2392242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76bb45221977b2e852be0939668b1cd1818b042fc87ebb5a17eee844df30e20c. 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/QZK6J2392243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2259ce74ceb63e140718af33ac98179e60e266c9db10fdebe3d2c5ec556ba336. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6J2392244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x611d1ca01d6992ebdf0e735ac99dacda2ab8e9b178842253177ba28678d70937. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:40:13Z), 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/QZK6J2392245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2584723f8603caeda58a62fa4cc96b18d002455a52c0d61fa28be4382f18d118. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZK6J2392246.