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 0x36f224adf4cdbe6f8212e2f5deca13429ec4e7a598545299bfa5225334cda6b3. 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/ee8ad1b2-8193-4026-a2cf-e6da7a8281b8.json and https://artists.proofprofile.net/proofs/artist/ee8ad1b2-8193-4026-a2cf-e6da7a8281b8.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 0xe798239cbed8a6e93ed16252017f360104aa91bdfd0d3313105787ecfb024b06. 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/QZS7J2408960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd470e00f6dc89d58a4166ae8fd0558282113f3d658744a4a90fa197060780e87. 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/QZS7J2406972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb425090e78ce2779fb6f1318a8bf21e10605661f1c7e02dc479ab509c1ced7de. 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/QZTLA2451049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f1e11927a52841932e368b3578b2dd08129126961f920a76a0ada508a8eb23. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZTLA2489186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f1021c19d5e09406cc5700e580d06ad70322b58b3831def760b30244c26087b. 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/QZTLA2440877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc982019b5de10cb4abc47855dde49fb9e4092bcb8532f74fe8c217e87ecbcb0. 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/QZTLA2418640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee95d4035e191ae6d67eb75a7b560337a709dbd494e7b40acc0dca4d965963d9. 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/QZS7J2400432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b975be67169a3f9f8c3719cc7471213b8e4c2c7a541b42458ae43822f7bc0ec. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QZS7J2498861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf928464b0e82ebec5ea7130d66a7781835a7c47a60b3cd5c2295299f3d9f9e. 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/QZS7J2481246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x492fab2c3fa41efd81703ba8a1972ae33ff8b922204dbdd31f78933cccb18ea8. 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/CH7811111180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0298a27126ad88d6180ecb2bf5a8fc9f86b955a3d813ba8895a4ce11bd148ced. 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/QZS7J2417936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418c31d97471f7f6fb24ff248068709cd8f18af5a02057c134a55b524626f5d1. 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/QZS7J2466012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30b96364a6b519b716917d638d2440c647631035ab126b0daa308dc47c797a83. 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/QZS7J2414363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa60c1015e13dd50b5763c909a1658bd558ca1d5e5dd6faf2e12c3ff2b2632c8a. 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/CA5KR2366969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfcf5a0fa613080d9172ab16cca0e96238235d724ce292db38bb4606f6253b06. 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/CA5KR2373849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x919e074f5358ae5c84f2f1968789099cf37f5a37e71da7759f9a4180f0e91c7c. 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/QZSYP2292929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc898109f08322591b1a25cd1316952832610e63041bf0a386190ea3c45087cc3. 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/USA2P2232015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d1c271ffb8268ab1154d95c6a5ecf8f5ce389ade261c529fe24f8773d18a929. 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/USA2P2237316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053b4f6edd12a3d0d48a83df9e99024624aa0332b2f537d5a437a198c9cca4a2. 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/USA2P2233565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c3bc2da59d30f4a307b07d8015704eea93ab23d457ee1f563e5a9f7b535130. 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/TCAFZ2101083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968d5b48eb5a76c1a1d70ce08d20ce29e5f4526f03016019f9b03e9b480e36e7. 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/TCAFJ2163625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41f17e3209ceb1d9f67c0d683552e9d9cc9e22616266077c78a549f4887c3a42. 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/TCAFZ2101104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185943d25283ae1f407555c1523c77f65062503e21d46b62a18769ee8209d179. 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/QZTLA2446720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f84cf82847bfcac06718badf5c9d65b8566109a44f93b0e198e79d94aac8a36. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZTLA2360183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102e0641cdc5ea9a5c65603cb59502f2a7549dbddb4733d6d49a4cda82fe479d. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:58:08Z), 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/CH7811108831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe947283612e30630288a8683e80f7d8581a3ed6cbfc0b89e5bcbe92bc20cb639. 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/USLD91738858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364d18a1fbfd884c3ea568b7e3d0b09ebbfbc96e453ecbbe123be6ce669a8a10. 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/QZQAY2467685.