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 0x495992ab2a2bd47b7677a9e6fa9e048cd4240ef884476cf85a085f5c9be2aeb9. 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/89c3bd29-cedb-4fd5-81f1-4041e9d16825.json and https://artists.proofprofile.net/proofs/artist/89c3bd29-cedb-4fd5-81f1-4041e9d16825.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 0x9bda89b4e69fa898ba629b2fd8bd5075b523204b1811a5f9c8b565f1da0c85fe. 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/USLFZ0710060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66dc65b56543557012fb5e8d7dcafeed41617fee5ca776b8f98848c165b67037. 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/USLFZ0710215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c5e9a8321404598eebd24c3525417a89255cfe447431a93717cacc3d6887644. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/USLFZ0710216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4c75b638e5746c5e906b2367e3fb01b1b2e3371752028029ac90f8645c0e8b1. 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/USLFZ0710217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf08fe9f9b15e111661618b5f2f7b138a0e2715680c71c1fec7867e91ecd3a32. 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/USLFZ0710218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c3bb2b30be01c2f48a7c196b752d1b3de332908e93a047edcff72dbda78e158. 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/USLFZ0710219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4afb68f3fa56748bc58a55c5a55c12b65e256b32e1cbec64ebad6bd6c2e640b. 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/USLFZ0710220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e84657cba52461558f6a16bea49c6ec1e210c44af7621cbd597ec4fd6374869. 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/USLFZ0710224.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0915d53963cf93d2c2134eeb9bc877c80960e18a29b550e4d485c91eded302c9. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/USLFZ0710227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48754fede828af3eba21694249a422a8626c815ea74d0b718d49965eea124f2d. 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/USLFZ0710183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b562fae602fa84c2247d8a9dc63bc80b57d32a1ab528de844c630829c87b97e. 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/USLFZ0710184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c98602a1fb07d04681717804c653b39dea11b8b5c4ca5b708c1795bec584510. 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/USLFZ0710185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f8225603700d6f80f935a956ce82920bf52bd2d118632fc65db6c94279d51d. 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/USLFZ0710186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984877bc87653213cf65a9ff843f7e94727f677a628de9cef1ff3d0142af95f0. 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/USLFZ0710187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5ce3619543387666bdeb16c7d17682547e70680eed72bd45f4cf84e67e308a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USLFZ0710188.