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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 0x1704bf750b3c15bf72bcf561d8fd3d98ab1b28532a21c9b5189a1d2ac0459858. Chain 2 (Bitcoin): anchored in block 953783 (2026-06-15T12:24:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7478d08-a789-4438-830b-846d882872e8.json and https://artists.proofprofile.net/proofs/artist/d7478d08-a789-4438-830b-846d882872e8.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 0x3d439a8f43a18d65599024f75026e7f0a9c1f4c6f24bd112ce87b16dc3e42d16. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/QZMEM2024311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536e3f4d571bfede86cdef4b597f2e31814890b6f1efc2c39feff257b1282c77. 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/QZMEM2024312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb47d7894fe6c72215491af9c957069cb5cda8b3de1f562fccfe9112e7a9ff1fe. 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/QZMEM2024313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43cec549bc1d217ee3b0864bd1a793ffe0592741c65d3ffb1eb41cc8113a9baf. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/QZMEM2024314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaeb233b545fa5dee557cc7d2bf954636ba446ed2842e65699b6503d6ac07798. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QZMEM2024315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6be09b3950d928ab49fdc8619cd22ebaa255e5b4931efa294d93b38a0fbac91. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/QZMEM2024316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84f40caecef1599b947863afc61dac79fc847ee67ee87847df52946d445b4709. 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/QZMEM2024317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ced5da6ff024c22d2bfde51794a7eae93e0723d12020e5718eb1e2e8bfe7d0. 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/DEZC62455161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d1411a25d737b5952be1ee55d317318f9228a794f847adc15948206aae9d40. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZTB92256352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6e93cfeaa2230306c5cb1be07df7bf35a741f26aeb7bf4074bb2f32523733d. 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/QZTB92256353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x292e088b4421b3e9489921b37eef26f6f2c99e22ed7295791d1253ba8112142c. 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/QZTB92256354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e169c4ecb77958e3d0996bd455bd6eb29eefe4d39390b2d2b06c0f5f05bc8f. 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/QZTB92256355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bb4c1eeceeb5f57cc8cfa9baa478f5a1e05e7d994bf49af35971f11c253af34. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZTB92256356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4692ec555b6b5c88c4001069a188aee0b84991950a9cd7316957580e40a3eda. 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/QZHNA2192105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e8cb93fa1259424e9da8508b995c0c05259353a07ab966dbbc3a724b94beda. 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/QZHNC2130474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd3446d8f9d02bd3ae2d3727c7585701ddfd3f51fdaf1d27217ecd4ae42c9f5. 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/QZHNC2130475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3282d3a1cd1ae7513852735836f6d27db3486ccf80ff37fbd28d291b83d1c6f0. 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/QZHNC2130476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38e49cf5e9f4a299cb9753fe74ce839a8ce2f29a4ad1aab23e682ba1061e667b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHNC2130477.