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 0xc890567e41a13286b3eec9bff96a535babb41141baaecbf40fdf825858d38a86. 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/7f992388-3426-44f3-8308-081d0dd93c5f.json and https://artists.proofprofile.net/proofs/artist/7f992388-3426-44f3-8308-081d0dd93c5f.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 0xb330bf3e20aaf5c8d30674791287d44d302704bb09e0cf452d284acbe9412d3b. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CAENV2079783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77abd654844b18720a70fa497c3f28d58235acb0bd4c9412da9859445445434d. 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/GBRKQ2043016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad318a47282c2128727f59a79088a9fdc748696f1dd44b04a203444898759ef. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/NLL562008861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc684f715871e17cf6b38e0ec81ab6090a7f14ddbc078c3978d75bb6012269ed2. 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/CACWV2240373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d84ad172ef71957bd526c63b415fa6ac0607bfc3a731e9763147914614d7954. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/CACWV2240370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2937b9cc32a1f0397f4f256bb30426c86efc825472e18304ae70812c2499fda2. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/NLCK42223517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ac6bfe837a6d3e10cb543ed8e3708b5edb80d4b50508e5d2e538da7c78f80c. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/FRDX62403200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a021824102d991c4579fba5f27f92cef7a2fc4824c375df265402170315ff55. 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/NLCK42417595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92e0031494b2e23be21ace4ee5d305a70a356775d289f719e42ff72513d28bc0. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLCK42417596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0e2255cfd3852dd47bb61b48f8f9f9e639478c6c9ae5105c810bb1a8103aaba. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/NLCK42417598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75ac6bfe837a6d3e10cb543ed8e3708b5edb80d4b50508e5d2e538da7c78f80c. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/FRDX62403200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1153513af96f970b29ff82028c0235f61848b49f27b043b87354b7270442d8b3. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZS652327788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc099ae82f2ff945378628bed16e1162d0b09c11ac2f0d15d7f7f68f4a8a6299. 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/GBBF00200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d0e5e8a1d0e048da784c859b543d3facec7bbe888f6e9d02dae03ab7c742fc5. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/NLCK42413404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x187ca965606963f9a8a141477cc49c56bb9c148f1c18dde8b050565befea34d7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BEN582200518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535a14dcd0a1601835577120f7036017dcfd68493a0eaa6ae9b043ac7b10f276. 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/GBKQU1984424.