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 0x25d47cf13ef46dd8ac83686a0117cfa96d3610575932f82cf900f100aa9d1c01. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a308ca5b-5ed9-48e3-a6cd-912ea77b48f5.json and https://artists.proofprofile.net/proofs/artist/a308ca5b-5ed9-48e3-a6cd-912ea77b48f5.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 0x9184af0cab63279053e16bb25d14315e3e43142b1f6739705912653d5ef8ec2c. 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/US2762101459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1903eab0c1ba5bfeb84b1a59c2be425947c8c26096183651d13f4352b1574a1c. 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/US2761993176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7862112a091e8d61f43bfad50d6fce49e6afb7ebabad9996c655c4f774f1e1. 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/US2762101460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d1f956a6e3549e5354c76fe4da1140de74520183a4458d20f5dbfffd3a6dee. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/US2762094581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3da8482800f3ef01c5e749eb11e96bf2c2e7d5227b53eeab9028e5ee156fd6. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/US2762101461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85b6a1c024cbae38c9b3f3eefea61fa3d3fd7cddce151acba8c5a7f66c69169. 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/US2762101462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd034826930da28543492b56ab5a1dc27054bc6553b0526aa99c078db034278. 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/US2762094392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a89333c756f8a507066098ce7a956be68e60b7047f340d6990234fd8654a596. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/US2762101464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4237c231ea5a3375813ed1bb6a1b69ee594558e25693064d1121ac88219b5cd4. 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/US2762101465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71e2ec0501d57857f7ea91d53087e718dd296f41086e3e71dbc8d63b0f18318c. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/UST8K1667722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7b57c6c70cc0cf9327b9e061e5dee2c7a1dd721b427b699ced852a8553e251. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/UST8K1667723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf37cb5e15193cae31e4d060cc65085822bed4bbeba656928e88985a0c9e5847. 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/UST8K1667724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f78ce5ce74884ad6c9711831212b5e07253de66bef4565a5e2b014f536826c8. 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/UST8K1667726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30757447b30c505730c161105efb9a32869b0f7b3eca903546e3a40fe057d0c9. 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/UST8K1667727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cd034826930da28543492b56ab5a1dc27054bc6553b0526aa99c078db034278. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/US2762094392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45d1f956a6e3549e5354c76fe4da1140de74520183a4458d20f5dbfffd3a6dee. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/US2762094581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1903eab0c1ba5bfeb84b1a59c2be425947c8c26096183651d13f4352b1574a1c. 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/US2761993176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52eff26e3431872e0c3631de28b479e73ec6648db8c8c562047068ef66c7509e. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZAPG1865400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bfc3f27c17ac1265fe5562319c251194750bc0f7585f14a99ffcbd07367d05f. 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/QZAPG1865401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90076dde3b9bb2a3f952385a35d560c9b800edcb27acfe216f9d9c6bdcdb2411. 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/OZAPG1865402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44d58e11f4dfa4437dc2cdaafbdd93c5c4c0e6bef6cbdf2afc60508d66a91cdc. 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/QZAPG1865403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e5c071724c29ad364c524dab8090b8a1e463c411fd89785a71d1cf2d7200bc4. 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/QAAPG1865404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4449ad6fce41a03900582844b9025e7d2bb654859a6aa8283b56719b7964c689. 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/QAAPG1865405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b60083aed75da2ade821b436b7430237a102485f0ce071db7154ba6a8172c0d. 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/QZANL1783309.