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 0x90e225c5d5af46318e8530b6968339eaa7dccf3aba93b4057b7afd69f48def59. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c3a81e51-8653-4ca8-933b-2e829ce2b81a.json and https://artists.proofprofile.net/proofs/artist/c3a81e51-8653-4ca8-933b-2e829ce2b81a.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 0x453ee0120f391dba04675b4dbde140346f022f68b713ea2ba5b85efc8311e701. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/BRTAP2101167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708f96af568cf3e6f20ddf84c74796f828a612e0e97f3a706e2563543fce15d9. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRTAP2101168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c347271db5f35b98e207a38ac6ed01cf64ebd991e55450688161910d8ff705. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BRTAP2101169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb59e90122b38cb3bf4a9633564d25fef57daba73b5acdcaa15841c42cf9db3. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/BRTAP2101173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a533f9eca381234916c78a87e48d96b03a6b115927b6b66887c72be72f11a44. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/BRTAP2101176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24e4ebd05d4e65d95774d85806ad7e997d057d4b4befadbc4a5e65e0e0dfd694. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BRTAP2101177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404db8f9d11f9cc921ea13b777d5c7fd84a7b9747246692875820d22279c82ca. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/BRTAP2101180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe69861a4bd720ad040610320bfdff214ef1d7183b2a57b3386130d794f27a28a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BRTAP2101181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22392c3760f191658dfc64eba0e5eaa7f4cee61a0bbefa8e97a5f1cef631c2e3. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BRTAP2101182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1853350d663911beead84e7c2d7595f0578b46602b4d4786f3c2f13d56846a1e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/BRTAP2101183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840db999a06f216e3d14aaf90cc117b72b1e915a46a0adc84c92d842339082f8. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BRTAP2101184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x914819c5ed47b3acb73debcf8dce76068ed9d2414e07a788a81b980bb3749398. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/BRTAP2101186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39c118c3167c5cd363c59fd848535fe717ed3aa74c66447b580a2c66c8c149f4. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BRTAP2101189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e30a8c865203133761510055281ad5b55852553be29e41c868de51ea08efa2. 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/BRTAP2101191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb9b69f2a11e9c0c31602077c507487c19b348b70b4442f6845663e1e4ad77b7. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BRTAP2101201.