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 0xd72f261db13239a2ee4b8df5bea4d209c8b03d11d12e11a05dafe7669cce1959. 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/b2b73118-1cac-4a72-bd7e-5a3ea1d81b8e.json and https://artists.proofprofile.net/proofs/artist/b2b73118-1cac-4a72-bd7e-5a3ea1d81b8e.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 0x07d3327300035792fbcd346fd39c1732bec1294ed08785ebdd3d3de769a42070. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZFYW1905501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8108810c2c42481bf89fa879aaf65ecb6644a1b88d1c488a4ca7d1d1a7e0d2d7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BK4DA2464220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b953d3ce7a4bb89574f989ac50baa78a7f743e0ba8912e1f8478fc02a88ac1. 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/BK4DA2464221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x024b4b6a424e57e1b64609f873201c6c860f01737f60e7c598b19efea3e2eea0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BK4DA2464229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b9917eac4c209cab957b1b3d11e76dcda318f16e3f5ebc08a24f5e10845383. 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/BK4DA2462479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27fc3bce6899ed1d55e3c73cd77122fb539d58afb853289dfddcd12a77a1ee9b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BK4DA2462480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e27210814a018ab5a26fc04a98a7cf362d8386ddec65091a8312276355f80fb. 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/BK4DA2462482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29ef41748ca44b98db6e6b34d700d435c94d0e8334bdf3b18b13eff2397478fd. 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/BK4DA2462483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e3b33de958228ab043e9478042cebdc35699a70076501ddff7bef4425476e6. 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/BK4DA2462485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595abd078690161a12cc0de72126a990706c541226b49ecb1650a45fbbbc94ff. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BK4DA2462486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7ed3b8a3371f2dd3a8a6b7f922aea367187e3198dabaa4ba93ecd67b4ad7b7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2298984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c31c17015d0c2cea614fd8b5ed5fe1fb35cdf77e0ee79d1b5667c5beb7640ae. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2298985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6284b5dc709ae05315fd475aae7a6a814c2b81f1534683fc2667bfec2b8dc5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2298986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34c106d28394acf792cdcabb49a3b9c3a9fb76806df67dae4fd11f0a844d7e1. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2298987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145d5750b0bd9b6b89cf047055c846291697fb86c942f6c40132fb420876a992. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2298988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28991d6f83db18f10df6e008974a6f46f2535fb3a33e19022e02648c0c36445c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYX2298989.