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 0x3850b093af7489ccb94c24eafe9798851d9fed8dc60ded29d2a2427934773e57. 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/62409121-67c8-4338-8c89-da72a7251698.json and https://artists.proofprofile.net/proofs/artist/62409121-67c8-4338-8c89-da72a7251698.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 0xf6ad0f04bfb710da689ddbe85857e544f6b9e7256ea58bf05aaccec0b1f21c07. 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/CA5KR2342743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff158c413f8a337abd6fcede98981fd1af8b2b9dd0c3d9d0f04fb515b9a1c88. 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/CA5KR2310875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5aac326d0ce08045cbd0d629c49c2268195f503e4dbe1f8b47e491232f2f37. 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/CA5KR2343819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e90c1fbe62bcd0aca2cd2cffa534185753e1bd2eadf0639bc9b99f4d37bfeed. 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/CA5KR2343820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff158c413f8a337abd6fcede98981fd1af8b2b9dd0c3d9d0f04fb515b9a1c88. 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/CA5KR2310875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4596431aa89162d0598e236f517df0a598ab8f3ace2b298efe3f07bc4a4fd269. 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/CA5KR2343821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ad0f04bfb710da689ddbe85857e544f6b9e7256ea58bf05aaccec0b1f21c07. 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/CA5KR2342743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75503cf8c85a973556034d64f2048f16c7bd2a5d2de7a6c9278237cc80da6980. 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/CA5KR2314690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x633d8ecd17c14caf1a14ea3ca5b02d837f4d163b613d62c73f5aae9c649e1338. 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/CA5KR2343822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3954b97a672939ed69da3a09c0e585970b01464c6f0339f94dba00dbb08c3f5f. 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/CA5KR2343824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e99e6d7006a66d54162e8b01851d46853217bbc680126d5d3437099f143423. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CA5KR2343826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151fcb8d363ea24ba3cad394d3a7e614ec42f5df4a6ddc1e9ac7d7545b0a617d. 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/CA5KR2343830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b5f36671007d202a48d1cd38a5dd7b6c76066747c013212469108a1175e980. 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/CA5KR2335693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a074bfba65cea6abae6dc27868eba43194544cd08186cf8db5417928eba0ba7. 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/CA5KR2305368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959237f5ff00eda20df07decbcb1f085d767f638f2da75b85f46e8619e0bb6f5. 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/CA5KR2298646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4c635c799b99f9c4f1cc3b88758e863e16b495ee51c0a99a02eeed11be679d5. 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/CA5KR2294411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2664bea94a3fa3d393d97593b3d280ba06fb2726c980ad637d0bcaec3fab47. 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/CA5KR2301412.