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 0x1191a49b87541c4059cd2f81cb21f70bdd274ea9b993a19ce7552d4811378728. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/16a6fc2e-9282-4291-84df-bd5d2724fa35.json and https://artists.proofprofile.net/proofs/artist/16a6fc2e-9282-4291-84df-bd5d2724fa35.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Intro (Letter from the Other Side of the Operation)
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 0xb3cf31aab86d324c354a01949b4ebca28cd526e452ab93b1d40a5ff016c3055d. 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/QZMEN2415327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bae34a3c34ca18b7b7d8627b8d51d7109da00c8c41990a929fa55da6a4bf8c7. 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/QZMEN2415328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3a57baf3061b08882c4128683a57ca7354f28bf717bbb4e1926ca33474a9cb5. 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/QZMEN2415329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba9e9e3bb4b604e645e31c988c8a1e90c83e8e9ef03aba30551b8c112f43b41. 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/QZK6G2468945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e915f16db6f2764b4d88157d87ba5ca5752bbc6b439d6f6f962a19041e2ca6e. 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/QZMEN2402407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4797988f537ccb47c66af1e3fde9f670f368df632d14fecb113985e36fa9955d. 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/QZMEN2415330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1998d9560803aff35df7ecd339c6030d9b738b1f72cc613703a6645dec5649ce. 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/QZMEN2400944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03e532ec842b72c942191e2397eddf0c2347ed32a88a5f1ac29b3687c838dbd. 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/QZFYY2400350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac47f8c348ea0494857138749aadddf3da706a9e97ed52bcf3b2a9bb54358f07. 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/QZMEN2415331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e915f16db6f2764b4d88157d87ba5ca5752bbc6b439d6f6f962a19041e2ca6e. 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/QZMEN2402407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba9e9e3bb4b604e645e31c988c8a1e90c83e8e9ef03aba30551b8c112f43b41. 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/QZK6G2468945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03e532ec842b72c942191e2397eddf0c2347ed32a88a5f1ac29b3687c838dbd. 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/QZFYY2400350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ef95729658e9c2b4945040fa6128a8430a54657b175dfcb61b6a3fe35d66e35. 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/QZNWQ2124714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c830480b981da73075f5785d7e24f821eb8a0ce238c32278bdbcc146272ce9. 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/QZNWQ2124715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d19f44ac3a9315e84a0b9faf3e19a9d660eeea5e10187383809e55c63f0480b. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZNWQ2124716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ae58c67a5d48a78dcc43ace2e74af1fd18b0440288904b51b1892179f5854f. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZNWQ2124717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdcf91116350aa5a339c3c46a72218d45e7330fd58059658c45158c936ad4fb. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/QZNWQ2124718.