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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 0x4b8cfaace8505169d7459ef492f5f2545eb8a19e49c8718d7929e02b150d2e84. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b4922772-eb40-4401-883d-f779990605cf.json and https://artists.proofprofile.net/proofs/artist/b4922772-eb40-4401-883d-f779990605cf.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 0x4a79208493408c7d52bd2008c3527fe80ba9db9879a37f6dc0522b6357a0f76e. 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/USH6C2409901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58123136d6a9429674c1d422e3724b25a710b90a2307e6aeac2db3767353c20d. 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/USH6C2409902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6608b1f2d47b3e0ae038d10764812e1bf4108e75f3c7eefbe7cc05bf20bd002e. 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/USH6C2409903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52bb20765e7b3a7d7e170e3f824af82ba9d8d0c74ffdd276dcecbeec42788d1a. 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/USH6C2409904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7703ab2b749a57c0f635a1d44e789cbd7798b1bb74cd098c64e731763a56044. 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/USH6C2409905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6608b1f2d47b3e0ae038d10764812e1bf4108e75f3c7eefbe7cc05bf20bd002e. 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/USH6C2409903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71dc6d26e93f360281f8bc2657b9c7ddade014992d3bae9da488b42175ce996f. 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/QZK6H2206837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397f456f3f371326e5a005cfee4c7994e3da208585983563c64c989bc8abff24. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-16T23:33:29Z), 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/QZK6H2204540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aaa5dd4b6db49ee12833c2e6ab258e2a8d08fedd857d4de4e614f25c4d3d456. 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/QZK6H2206838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d0a2810c10f1e6bbeae90f2d263a6347ecced22f0be76fecd38503e841bb8f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZK6H2206839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397f456f3f371326e5a005cfee4c7994e3da208585983563c64c989bc8abff24. 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/QZK6H2204540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff59a7d44eb8bd5732f04bdd95c7cbfc7970adf15967e965eca37bf7c71f8f4. 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/QZES82073181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x209765ac163899e082d3470360d066a49ce65bada0f0a4686488be60f90121f0. 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/USHM82066732.